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FISH TERMINOLOGIES

Defence of Britain

Report Format: Hierarchical listing - alpha

Notes: No longer actively maintained

Date: February 2020

ABLUTIONS BLOCK SN A building used as a control centre for the Air SN A building housing toilets and washing facilities. Raid Precautions network, responsible for issuing CL MILITARY DEFENCE AND air raid warnings and coordinating fire and BT ANCILLARY BUILDING rescue services. RT BARRACK BLOCK CL MILITARY DEFENCE AND FORTIFICATION BT AIR RAID PRECAUTIONS SITE ACCESS HOLE AIR RAID PRECAUTIONS HEADQUARTERS CL MILITARY DEFENCE AND FORTIFICATION BT DOMESTIC SITE SN A building used during the Second World War to co-ordinate action against enemy air raids. ACCOMMODATION HUT CL MILITARY DEFENCE AND FORTIFICATION SN A hut used for the accommodation of members of BT AIR RAID PRECAUTIONS SITE the armed forces. AIR RAID PRECAUTIONS LANTERN CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING SN A specialized lantern, with a reduced glare, for use in air raids. ACTIVE AIR DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION SN A site equipped for active defensive action BT AIR RAID PRECAUTIONS SITE against an airborne enemy assault. AIR RAID PRECAUTIONS OBSERVATION POST CL MILITARY DEFENCE AND FORTIFICATION BT AIR DEFENCE SITE SN An observation post used by Air Raid NT ANTI AIRCRAFT DEFENCE SITE Precautions wardens to watch for aircraft and BLOODHOUND MISSILE LAUNCH SITE bomb strikes. BOMBING DECOY SITE CL MILITARY DEFENCE AND FORTIFICATION FIGHTER COMMAND STATION BT AIR RAID PRECAUTIONS SITE PARACHUTE AND CABLE LAUNCHER AIR RAID PRECAUTIONS REPORT CENTRE THOR MISSILE LAUNCH SITE SN A centre used by the Air Raid Precautions ADMIRALTY SIGNAL ESTABLISHMENT network to co-ordinate reports of air raids in an SN A building or site conducting research into area. communication techniques for use in the Royal CL MILITARY DEFENCE AND FORTIFICATION Navy. BT AIR RAID PRECAUTIONS SITE CL MILITARY DEFENCE AND FORTIFICATION AIR RAID PRECAUTIONS SIGN ADMIRALTY SIGNAL STATION SN A sign used by the Air Raid Precautions network SN A building or site used for naval communications. to assist in identifying vital equipment and CL MILITARY DEFENCE AND FORTIFICATION resources in the event of an air raid or to aid movement during blackouts. AEROPLANE REPAIR SECTION SHED CL MILITARY DEFENCE AND FORTIFICATION SN A shed used for the maintenance and repair of BT AIR RAID PRECAUTIONS SITE aircraft. CL MILITARY DEFENCE AND FORTIFICATION AIR RAID PRECAUTIONS SIGNAL BOX BT TECHNICAL AND INSTRUCTIONAL SITE SN A brick built railway signal box, usually with a reinforced correct roof, designed to minimize the Aeroplane Shed (Type A) effects of blast damage from aerial bombardment USE AIRCRAFT HANGAR (TYPE A) and thus protect the signalling equipment. Aeroplane Shed (Type B) CL MILITARY DEFENCE AND FORTIFICATION BT AIR RAID PRECAUTIONS SITE USE AIRCRAFT HANGAR (TYPE B) AIR RAID PRECAUTIONS SITE Aeroplane Shed (Type C) SN A site used by the Air Raid Precautions network. USE AIRCRAFT HANGAR (TYPE C) Use more specific term. AIR DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION CIVIL DEFENCE SITE SN A site equipped for passive or active defence BT against an airborne enemy assault. NT AIR RAID PRECAUTIONS CENTRE CL MILITARY DEFENCE AND FORTIFICATION AIR RAID PRECAUTIONS HEADQUARTERS AIR RAID PRECAUTIONS LANTERN BT DEFENCE SITE AIR RAID PRECAUTIONS OBSERVATION POST NT ACTIVE AIR DEFENCE SITE AIR RAID PRECAUTIONS REPORT CENTRE PASSIVE AIR DEFENCE SITE AIR RAID PRECAUTIONS SIGN AIR FORCE HEADQUARTERS AIR RAID PRECAUTIONS SIGNAL BOX SN A building used for the daily administration of the AIR RAID PRECAUTIONS STORE Royal Air Force. AIR RAID PRECAUTIONS TRAINING CENTRE CL MILITARY DEFENCE AND FORTIFICATION AIR RAID WARDENS POST BT MILITARY HEADQUARTERS AIR RAID WARNING SIREN NT AIR TRAINING CORPS HEADQUARTERS FIREWATCHERS POST AIR RAID PRECAUTIONS CENTRE AIR RAID PRECAUTIONS STORE

2 SN A building used for the storage and distribution of SN A structure used for the housing and servicing of civilian respirators and Air Raid Precautions aircraft. equipment. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AIRCRAFT STORAGE FACILITY BT AIR RAID PRECAUTIONS SITE NT AIRCRAFT HANGAR (TRANSPORTABLE) AIRCRAFT HANGAR (TYPE A) AIR RAID PRECAUTIONS TRAINING CENTRE AIRCRAFT HANGAR (TYPE A1) SN A centre used to train Air Raid Precautions AIRCRAFT HANGAR (TYPE A2) wardens. AIRCRAFT HANGAR (TYPE B) CL MILITARY DEFENCE AND FORTIFICATION AIRCRAFT HANGAR (TYPE B1) BT TRAINING SITE AIRCRAFT HANGAR (TYPE B2) AIR RAID PRECAUTIONS SITE AIRCRAFT HANGAR (TYPE C) AIRCRAFT HANGAR (TYPE D) AIRCRAFT HANGAR (TYPE E) SN A fortified structure used to protect civilians AIRCRAFT HANGAR (TYPE J) and/or military personnel from enemy bombing. AIRCRAFT HANGAR (TYPE K) CL MILITARY DEFENCE AND FORTIFICATION AIRCRAFT HANGAR (TYPE L) BT CIVIL DEFENCE SITE AIRCRAFT HANGAR (TYPE S) NT ANDERSON SHELTER AIRCRAFT HANGAR (TYPE VR1) AIRCRAFT HANGAR (TYPE VR2) CONSOL SHELTER BARRAGE BALLOON HANGAR MORRISON SHELTER BUTLER COMBAT HANGAR RAIDSAFE SHELTER HINAIDI AIRCRAFT SHED REGIONAL GOVERNMENT SHELTER LAMELLA HANGAR RT NUCLEAR ROBINS (TYPE B) AIR RAID WARDENS POST SUPER ROBINS SUPER ROBINS (TYPE A) SN A purpose-built or adapted structure used by an Air Raid Warden for coordinating activities. AIRCRAFT HANGAR (TRANSPORTABLE) CL MILITARY DEFENCE AND FORTIFICATION SN An aircraft hangar designed to be moved from BT AIR RAID PRECAUTIONS SITE site to site as necessary. AIR RAID WARNING SIREN CL MILITARY DEFENCE AND FORTIFICATION BT AIRCRAFT HANGAR SN A siren used to warn of an impending attack by NT AIRCRAFT HANGAR (TYPE T) enemy aircraft. BELLMAN HANGAR CL MILITARY DEFENCE AND FORTIFICATION BESSONNEAU HANGAR (TYPE H) BT AIR RAID PRECAUTIONS SITE BLISTER HANGAR AIR SEA RESCUE STATION CALLENDER HANGAR SN A site or building used to co-ordinate Air-Sea FROMSON HANGAR Rescue operations. MAIN HANGAR CL MILITARY DEFENCE AND FORTIFICATION PENTAD HANGAR BT MILITARY BASE AIRCRAFT HANGAR (TYPE A) AIR TRAINING CORPS HEADQUARTERS UF Aeroplane Shed (Type A) SN A permanent military RAF aircraft hangar type, SN A building used for the daily administration of that designed in 1924. It features a steel frame (with branch of the RAF dealing with training pilots. longitudinal ridge and valley trusses for the roof) CL MILITARY DEFENCE AND FORTIFICATION reinforced concrete and brick infilling for the BT AIR FORCE HEADQUARTERS walls. Typically 122 foot span by 249 foot in AIRCRAFT COMPASS PLATFORM length. SN A circular concrete platform onto which aircraft CL MILITARY DEFENCE AND FORTIFICATION would be taxied allowing the ground crew to BT AIRCRAFT HANGAR calibrate, check and adjust the accuracy of the AIRCRAFT HANGAR (TYPE A1) aircrafts compass, usually by rotating the SN An aircraft hangar built to Air Ministry design. platform. Mainly constructed on aircraft factory CL MILITARY DEFENCE AND FORTIFICATION aerodromes. BT AIRFIELD SITE CL MILITARY DEFENCE AND FORTIFICATION AIRCRAFT CRASH SITE BT AIRCRAFT HANGAR SN A site which is known, or believed to be, where AIRCRAFT HANGAR (TYPE A2) an aircraft crashed. It is an offence to interfere SN An aircraft hangar built to Air Ministry design with the wreckage of crashed military aircraft number 454/43. Mainly constructed on aircraft without a licence (Protection of Military Remains factory aerodromes Act 1986). CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AIRCRAFT HANGAR AIRCRAFT HANGAR UF Aircraft Shed

3 AIRCRAFT HANGAR (TYPE B) on its side used in World War II. It was intended UF Aeroplane Shed (Type B) for storage purposes on Aircraft Storage Unit SN Aircraft hangars designed by T. Bedford stations. Consulting Engineers to meet the requirement to CL MILITARY DEFENCE AND FORTIFICATION repair damaged heavy bombers in situ on their BT AIRCRAFT HANGAR airfields. AIRCRAFT HANGAR (TYPE L) CL MILITARY DEFENCE AND FORTIFICATION UF Aircraft Storage Shed (Type L) BT AIRCRAFT HANGAR SN A curved military aircraft hangar produced in AIRCRAFT HANGAR (TYPE B1) 1939. The frame is steel which is then clad with steel sheeting and reinforced concrete and SN A large type of military repair hangar mainly used typically covered with a thin layer of concrete, on WWII bomber bases, constructed using steel earth and turf. stanchions and clad in corrugated iron. B 1 CL MILITARY DEFENCE AND FORTIFICATION hangars were part of a series of prefabricated BT AIRCRAFT HANGAR buildings intended to supplement existing hangars on bases. AIRCRAFT HANGAR (TYPE S) CL MILITARY DEFENCE AND FORTIFICATION SN A small transportable hangar built by the Teesdie BT AIRCRAFT HANGAR Bridge and Engineering Company. Mainly used on AIRCRAFT HANGAR (TYPE B2) RNAS airfields for folding wing aircraft. CL MILITARY DEFENCE AND FORTIFICATION SN An aircraft hangar designed by T. Bedford BT AIRCRAFT HANGAR Consulting Engineers usually erected on aircraft factory sites rather than operational airfields. AIRCRAFT HANGAR (TYPE T) CL MILITARY DEFENCE AND FORTIFICATION SN A temporary, steel-framed transportable hangar BT AIRCRAFT HANGAR developed by Teesside Bridge and Engineering AIRCRAFT HANGAR (TYPE C) Company to replace the obsolete Bellman hangars.A temporary, steel-framed transportable UF Aeroplane Shed (Type C) hangar. SN A type of large steel framed aircraft hangar CL MILITARY DEFENCE AND FORTIFICATION introduced by the Royal Air Force in its Expansion BT AIRCRAFT HANGAR (TRANSPORTABLE) Period with a number of designs between 1934 NT AIRCRAFT HANGAR (TYPE T1) and 1939, to accomodate heavy bombers. AIRCRAFT HANGAR (TYPE T2) CL MILITARY DEFENCE AND FORTIFICATION AIRCRAFT HANGAR (TYPE T3) BT AIRCRAFT HANGAR AIRCRAFT HANGAR (TYPE T1) AIRCRAFT HANGAR (TYPE D) SN A type of steel framed transportable British UF Aircraft Shed (Type D) military aircraft hangar developed from SN A military storage aircraft hangar built in the late 1941onwards. The hangar had a steel frame, 1930s. It comprises a semicircular concrete some versions used commercially available structure with reinforced concrete columns, sheeting for cladding. It was similar to but smaller featuring a curved roof and straight walls. than the arcraft hangar type T2. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AIRCRAFT HANGAR BT AIRCRAFT HANGAR (TYPE T) AIRCRAFT HANGAR (TYPE E) AIRCRAFT HANGAR (TYPE T2) UF Aircraft Storage Shed (Type E) SN A type of temporary military aircraft hangar SN A military storage aircraft hangar designed in introduced in 1940; of steel welded and bolted 1937. It has a curved profile and is constructed construction typically clad in galvanized from steel ribs supporting a concrete skin. The corrugated iron sheets. The T2 became the roof is covered with earth and turf. standard temporary hangar for the RAF in World CL MILITARY DEFENCE AND FORTIFICATION War Two. BT AIRCRAFT HANGAR CL MILITARY DEFENCE AND FORTIFICATION AIRCRAFT HANGAR (TYPE J) BT AIRCRAFT HANGAR (TYPE T) UF Aircraft Shed (Type J) AIRCRAFT HANGAR (TYPE T3) SN A large steelframed military aircraft hangar SN A steel framed transportable hangar similar in designed in 1939, intended for aircraft construction to Type T2 but about half the size. maintenance on operational stations. It includes Designed in 1941 and 1942. side annexes for workshops and offices, CL MILITARY DEFENCE AND FORTIFICATION provided with a large number of windows. The BT AIRCRAFT HANGAR (TYPE T) annexes are of brick or concrete. CL MILITARY DEFENCE AND FORTIFICATION AIRCRAFT HANGAR (TYPE VR1) BT AIRCRAFT HANGAR SN A single-span aircraft hangar designed by AIRCRAFT HANGAR (TYPE K) Boulton & Paul of London and Norwich (drawing number 4178/44). Mainly used on aircraft factory UF Aircraft Storage Shed (Type K) sites and at Armament Training Schools. SN A type of large permanent military aircraft hangar CL MILITARY DEFENCE AND FORTIFICATION with a curved steel frame and storage annexes BT AIRCRAFT HANGAR

4 buildings of an airfield. AIRCRAFT HANGAR (TYPE VR2) CL MILITARY DEFENCE AND FORTIFICATION SN A double-span aircraft hangar designed by BT DEFENCE SITE Boulton & Paul of London and Norwich. Mainly NT ANTI LANDING OBSTACLE used on aircraft factory sites and at Armament BATTLE HEADQUARTERS Training Schools. BISON MOBILE CL MILITARY DEFENCE AND FORTIFICATION PICKETT HAMILTON FORT BT AIRCRAFT HANGAR PILLBOX (AIR MINISTRY PATTERN) Aircraft Landing Ground SEAGULL TRENCH USE AIRFIELD AIRFIELD SITE AIRCRAFT LEVEL CROSSING SN A site, usually including hangars, runway and ancillary buildings, used for the storage, SN A level crossing designed to allow the passage maintenance and take off and landing of aircraft. of aircraft to and from a runway which has a CL MILITARY DEFENCE AND FORTIFICATION railway or road running through it. BT TRANSPORT SITE CL MILITARY DEFENCE AND FORTIFICATION NT AIRCRAFT COMPASS PLATFORM BT AIRFIELD SITE AIRCRAFT LEVEL CROSSING AIRCRAFT MAINTENANCE UNIT AIRCRAFT STORAGE FACILITY AIRFIELD SN A site use for the maintenace of aircraft. CONTROL TOWER CL MILITARY DEFENCE AND FORTIFICATION DISPERSAL PEN BT TECHNICAL AND INSTRUCTIONAL SITE DISPERSED SITE Aircraft Shed POWER GENERATION SITE USE AIRCRAFT HANGAR STORAGE FACILITY TECHNICAL AND INSTRUCTIONAL SITE Aircraft Shed (Type D) AIRMENS QUARTERS USE AIRCRAFT HANGAR (TYPE D) SN A building where non-commissioned aircrew are Aircraft Shed (Type J) housed. USE AIRCRAFT HANGAR (TYPE J) CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING AIRCRAFT STORAGE FACILITY AIRSHIP STATION SN A site, building or structure used to store aircraft. Use more specific term. SN A site, including hangars, moorings and ancillary CL MILITARY DEFENCE AND FORTIFICATION buildings, used for the storage, maintenance, take BT AIRFIELD SITE off and landing of airships. NT AIRCRAFT HANGAR CL MILITARY DEFENCE AND FORTIFICATION SEAPLANE SHED Alan Williams Aircraft Storage Shed (Type E) USE ALLAN WILLIAMS TURRET AIRCRAFT HANGAR (TYPE E) USE ALLAN WILLIAMS TURRET Aircraft Storage Shed (Type K) UF Alan Williams Turret USE AIRCRAFT HANGAR (TYPE K) Allen Williams Turret SN A rotating, domed, steel turret set over a circular Aircraft Storage Shed (Type L) pit used as a gun emplacement. USE AIRCRAFT HANGAR (TYPE L) CL MILITARY DEFENCE AND FORTIFICATION AIRFIELD BT PILLBOX UF Aircraft Landing Ground Allen Williams Turret SN An area or site used for the landing and take-off USE ALLAN WILLIAMS TURRET of aircraft, often including associated buildings, AMBULANCE PARK equipment and other installations. CL MILITARY DEFENCE AND FORTIFICATION SN A site where ambulances can br parked and BT AIRFIELD SITE stored. NT EMERGENCY LANDING GROUND CL MILITARY DEFENCE AND FORTIFICATION BT VEHICLE PARK AIRFIELD BUILDING AMBULANCE STATION SN A building found on, or associated with, an airfield. SN A building where ambulances and paramedic CL MILITARY DEFENCE AND FORTIFICATION personnel are housed awaiting emergency calls. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION NT PHOTO INTERPRETATION CENTRE BT ANCILLARY BUILDING QUADRANT TOWER AMMUNITION DEPOT AIRFIELD DEFENCE SITE UF Ammunition Dump SN A site or building associated with active or SN A building or site used for the storage and passive defence of the landing ground and distribution of ammunition.

5 CL MILITARY DEFENCE AND FORTIFICATION they were often semi-sunken and the structure BT DEPOT then covered with soil for added protection. CL MILITARY DEFENCE AND FORTIFICATION Ammunition Dump BT AIR RAID SHELTER USE AMMUNITION DEPOT ANTENNA ARRAY AMMUNITION STORE SN A structure used for the transmission and SN An building or installation used for the storage of interception of radio signals. Usually composed of ammunition. a number of different elements such as aerials, CL MILITARY DEFENCE AND FORTIFICATION receiving equipment and supporting pylons. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION NT BOMB STORE BT PASSIVE AIR DEFENCE SITE EARLY WARNING SITE AMPHIBIOUS BASE ANTI AIRCRAFT BATTERY SN A site or building used for the storage and maintenance of both land and sea vehicles and SN A site containing one or more pieces from which terrestrial or maritime operations and/or rocket launchers for firing at enemy could be carried out. aircraft. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT MILITARY BASE BT ANTI AIRCRAFT DEFENCE SITE NT ANTI AIRCRAFT BATTERY COMMAND POST ANCILLARY BUILDING ANTI AIRCRAFT GUN EMPLACEMENT SN Buildings, used for a variety of purposes, BATTERY OBSERVATION POST providing support to essential services or for a HEAVY ANTI AIRCRAFT BATTERY central function. Use more specific term. LIGHT ANTI AIRCRAFT BATTERY CL MILITARY DEFENCE AND FORTIFICATION Z BATTERY BT DEFENCE SITE RT BATTERY ENGINE HOUSE NT ABLUTIONS BLOCK ANTI AIRCRAFT BATTERY COMMAND POST ACCOMMODATION HUT AIRFIELD BUILDING SN A command post used to direct the guns of an AIRMENS QUARTERS anti aircraft battery. AMBULANCE STATION CL MILITARY DEFENCE AND FORTIFICATION AMMUNITION STORE BT COMMAND POST ARMOURY ANTI AIRCRAFT BATTERY BARRACK BLOCK ANTI AIRCRAFT DEFENCE SITE BARRACKS SN Sites, buildings and structures for the control and BILLET mounting of anti aircraft artillery. Also, structures for passive or indirect defence against enemy COMMAND POST aircraft. COMMUNICATIONS BUILDING CL MILITARY DEFENCE AND FORTIFICATION ENGINE HOUSE BT ACTIVE AIR DEFENCE SITE FIRE STATION NT ANTI AIRCRAFT BATTERY GENERATOR HOUSE ANTI AIRCRAFT GUN TOWER GUARDHOUSE ANTI AIRCRAFT OPERATIONS ROOM HOME GUARD HEADQUARTERS BARRAGE BALLOON SITE HOME GUARD OBSERVATION POST SEARCHLIGHT BATTERY HOME GUARD SHELTER HOME GUARD STORE ANTI AIRCRAFT GUN EMPLACEMENT MESS SN A gun emplacement equipped with anti aircraft MILITARY HEADQUARTERS artillery. MILITARY OFFICE CL MILITARY DEFENCE AND FORTIFICATION NAAFI BUILDING BT ANTI AIRCRAFT BATTERY NISSEN HUT GUN EMPLACEMENT OBSERVATION POST OFFICERS QUARTERS ANTI AIRCRAFT GUN POST QUARTERMASTERS STORE SN A light anti aircraft position, usually open-walled QUONSET HUT and built of concrete, brick or used to RECEPTION CENTRE emplace one or more machine guns mounted on RECREATION HUT pintels. REGIMENTAL HEADQUARTERS CL MILITARY DEFENCE AND FORTIFICATION REQUISITIONED BUILDING BT LIGHT ANTI AIRCRAFT BATTERY ROMNEY HUT WAR PRODUCTION FACTORY ANTI AIRCRAFT GUN TOWER WORKSHOP SN A purpose-built firing platform on which an anti- ANDERSON SHELTER aircraft battery could be emplaced. CL MILITARY DEFENCE AND FORTIFICATION SN An air raid shelter, designed to be placed in the BT ANTI AIRCRAFT DEFENCE SITE garden. Made from prefabricated components,

6 ANTI AIRCRAFT OPERATIONS ROOM airborne forces. SN A one or two storey reinforced concrete CL MILITARY DEFENCE AND FORTIFICATION structure, usually associated with two T-shaped BT ANTI LANDING OBSTACLE radio masts. Term is specific to army anti-aircraft ANTI MOTOR TORPEDO BOAT BATTERY control centres operational between 1950-55. SN A coastal battery containing one or more artillery CL MILITARY DEFENCE AND FORTIFICATION pieces for to defend the coast against hostile BT ANTI AIRCRAFT DEFENCE SITE motor torpedo boats. ANTI BOAT LANDING OBSTACLE CL MILITARY DEFENCE AND FORTIFICATION BT COAST ARTILLERY BATTERY SN Obstacles, including scaffolding and anti blocks designed to impede an enemy's attempts ANTI SEAPLANE OBSTACLE to land forces onto open beaches. SN A purpose built obstruction placed in a stretch of CL MILITARY DEFENCE AND FORTIFICATION water to prevent the landing of seaplanes or BT ANTI INVASION DEFENCE SITE flying boats. COASTAL DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION NT BEACH SCAFFOLDING BT ANTI LANDING OBSTACLE PIMPLE ANTI SUBMARINE DEFENCE Anti Glider Obstacle SN Defence sites and structures including passive ANTI LANDING OBSTACLE USE and active defences such as netting, chain ANTI INVASION DEFENCE SITE booms and mines designed to prevent submarines approaching strategic ports. SN Sites, buildings and structures associated with CL MILITARY DEFENCE AND FORTIFICATION the defence of the British Isles against invasion BT ANTI INVASION DEFENCE SITE from seaborne or airborne forces. CL MILITARY DEFENCE AND FORTIFICATION ANTI TANK BLOCK BT DEFENCE SITE SN A reinforced concrete block designed to obstruct NT ANTI BOAT LANDING OBSTACLE the progress of a tank or armoured vehicle. Use ANTI LANDING OBSTACLE more specific type where known. ANTI SUBMARINE DEFENCE CL MILITARY DEFENCE AND FORTIFICATION ANTI TANK ISLAND BT ANTI TANK ISLAND ANTI TANK OBSTACLE ANTI TANK OBSTACLE AUXILIARY UNIT SITE NT BUOY ENTANGLEMENT CALTROP BUNKER COFFIN CENTRE OF RESISTANCE CONE CHECKPOINT CUBE DEFENDED LOCALITY CYLINDER DEMOLITION CHARGE SITE PIMPLE FIELDWORK TETRAHEDRON GUN EMPLACEMENT LYON LIGHT EMPLACEMENT ANTI TANK PETROLEUM WARFARE SITE UF Anti Tank Trap PILLBOX Anti Tank Trench RAILBLOCK SN A ditch designed to obstruct the progress of a ROADBLOCK tank or armoured vehicle. Use more specific type SPIGOT MORTAR EMPLACEMENT where known. STOP LINE CL MILITARY DEFENCE AND FORTIFICATION VULNERABLE DEFILE BT ANTI TANK ISLAND ANTI LANDING OBSTACLE ANTI TANK OBSTACLE NT ANTI TANK DITCH (ARTIFICIAL) UF Anti Glider Obstacle ANTI TANK DITCH (NATURAL IMPROVED) SN Obstacles placed in open spaces and alongside roads designed to prevent the successful landing ANTI TANK DITCH (ARTIFICIAL) of enemy airborne forces. SN A man made ditch designed to obstruct the CL MILITARY DEFENCE AND FORTIFICATION progress of a tank or armoured vehicle. Ditches BT AIRFIELD DEFENCE SITE were often reveted with concrete or wood. ANTI INVASION DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION NT ANTI LANDING TRENCH BT ANTI TANK DITCH ANTI SEAPLANE OBSTACLE CABLE ANTI TANK DITCH (NATURAL IMPROVED) POLE SN A natural ditch the depth and/or width of which RT DEFENDED LOCALITY has been increased so as to prevent the FIELDWORK progress of a tank or armoured vehicle. ANTI LANDING TRENCH CL MILITARY DEFENCE AND FORTIFICATION BT ANTI TANK DITCH SN A purpose built trench designed to prevent the successful landing of enemy glider-borne and ANTI TANK GIRDER

7 SN A metal girder, usually of iron or steel, embedded ANTI TANK SCAFFOLDING in the ground designed to obstruct the progress of hostile or armoured vehicles. SN Scaffolding intended to impede the advance of CL MILITARY DEFENCE AND FORTIFICATION enemy armoured divisions. Often found in BT ANTI TANK ISLAND association with "one way" anti tank ditches. ANTI TANK OBSTACLE CL MILITARY DEFENCE AND FORTIFICATION BT ANTI TANK ISLAND ANTI TANK GUN EMPLACEMENT ANTI TANK OBSTACLE SN A defensive structure or site where an anti tank Anti Tank Trap gun is situated. CL MILITARY DEFENCE AND FORTIFICATION USE ANTI TANK DITCH BT GUN EMPLACEMENT Anti Tank Trench NT PILLBOX (TYPE FW3/28) USE ANTI TANK DITCH PILLBOX (TYPE FW3/28A) RT DEFENDED LOCALITY ANTI TANK VERTICAL RAIL STOP LINE UF Hedgehog ANTI TANK GUNNERY RANGE SN A road block formed by placing rails or girders in an upright position in sockets in the road surface, SN An area of ground on which anti tank guns can forming a moveable barrier. be placed for testing purposes and to practice CL MILITARY DEFENCE AND FORTIFICATION firing at targets. BT ANTI TANK ISLAND CL MILITARY DEFENCE AND FORTIFICATION ANTI TANK OBSTACLE BT ARTILLERY FIRING RANGE ANTI TANK WALL ANTI TANK HAIRPIN SN A wall, usually of reinforced concrete, designed SN A road block formed by placing curved rails, to obstruct the progress of a tank or armoured "hairpins", in sockets in the road surface. vehicle. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ANTI TANK ISLAND BT ANTI TANK ISLAND ANTI TANK OBSTACLE ANTI TANK OBSTACLE RT ROADBLOCK ANTI TANK WALL (ASSAULT TRAINING) ANTI TANK ISLAND SN An anti tank wall constructed specifically to be SN A designated area within a town or village with used for training purposes. fixed defences such as pillboxes, anti tank CL MILITARY DEFENCE AND FORTIFICATION ditches and gun emplacements, designed to BT TRAINING SITE threaten the flanks of an enemy force which had broken through a stop line. Armco Pillbox CL MILITARY DEFENCE AND FORTIFICATION USE PILLBOX (TYPE FW3/25) BT ANTI INVASION DEFENCE SITE NT ANTI TANK BLOCK ARMOURY ANTI TANK DITCH SN A secure building where weaponry and ANTI TANK GIRDER ammunition are kept. ANTI TANK HAIRPIN CL MILITARY DEFENCE AND FORTIFICATION ANTI TANK SCAFFOLDING BT ANCILLARY BUILDING ANTI TANK VERTICAL RAIL ANTI TANK WALL ARMY CAMP RAILBLOCK SN A site, including barracks and ancillary buildings ROADBLOCK used for the accommodation of soldiers. ANTI TANK OBSTACLE CL MILITARY DEFENCE AND FORTIFICATION BT SN Obstacles, usually constructed of concrete and/or metal, designed to prevent the advance of ARMY HEADQUARTERS enemy armoured divisions in the event of a SN A building used for the daily administration of an successful invasion. army. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ANTI INVASION DEFENCE SITE BT MILITARY HEADQUARTERS NT ANTI TANK BLOCK ART STORAGE FACILITY ANTI TANK DITCH ANTI TANK GIRDER SN A site used for the safe storage of the art held in ANTI TANK HAIRPIN the national collections. During the Second World ANTI TANK SCAFFOLDING War many paintings, sculptures and works of art ANTI TANK VERTICAL RAIL were moved to modified mines for safe keeping ANTI TANK WALL to protect them against bomb damage. RT DEFENDED LOCALITY CL MILITARY DEFENCE AND FORTIFICATION RAILBLOCK BT STORAGE FACILITY ROADBLOCK ARTILLERY FIRING RANGE STOP LINE

8 SN A piece of ground, or a building, on which artillery NT AUXILIARY UNIT OPERATIONAL BASE may be fired at targets. AUXILIARY UNIT SPECIAL DUTIES BASE CL MILITARY DEFENCE AND FORTIFICATION AUXILIARY UNIT SPECIAL DUTIES BASE BT WEAPON TESTING FACILITY NT ANTI TANK GUNNERY RANGE SN A well concealed structure, usually constructed undergound, intended for use by members of the AUXILIARY FIRE STATION Special Duties section of the Auxiliary Units (or SN A fire station built for use by the Auxiliary Fire British Resistance Organization) in the event of Service, established in 1938 to supplement invasion. existing local brigades. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AUXILIARY UNIT SITE NT AUXILIARY UNIT SPECIAL DUTIES CONTROL AUXILIARY HOSPITAL STATION SN A building temporarily requistioned for use as a AUXILIARY UNIT SPECIAL DUTIES OUTSTATION hospital. Auxiliary hospitals treated the less AUXILIARY UNIT SPECIAL DUTIES ZERO seriously wounded and were less strict than STATION military hospitals although they remained under AUXILIARY UNIT SPECIAL DUTIES CONTROL STATION military control. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AUXILIARY UNIT SPECIAL DUTIES BASE AUXILIARY UNIT BOMB STORE SN A structure, usually well concealed, used to AUXILIARY UNIT SPECIAL DUTIES OUTSTATION store explosives intended for use by the Auxiliary SN A hideout containing radio equipment to be used Units (or British Resistance Organization) in the by the Special Duties sections of the Auxiliary event of an invasion. Units to send information to the control station for CL MILITARY DEFENCE AND FORTIFICATION relaying to headquarters. BT AUXILIARY UNIT OPERATIONAL BASE CL MILITARY DEFENCE AND FORTIFICATION BT AUXILIARY UNIT SPECIAL DUTIES BASE AUXILIARY UNIT CONTROL STATION SN An underground hideout containing radio AUXILIARY UNIT SPECIAL DUTIES ZERO STATION equipment to be used by the Auxiliary Units to CL MILITARY DEFENCE AND FORTIFICATION relay information gained from the various out- BT AUXILIARY UNIT SPECIAL DUTIES BASE stations back to headquarters. Avenue Type Flarepath Site CL MILITARY DEFENCE AND FORTIFICATION BT AUXILIARY UNIT OPERATIONAL BASE USE Q SITE Auxiliary Unit Hideout BARBED WIRE ENTANGLEMENT USE AUXILIARY UNIT OPERATIONAL BASE SN One or more coils of barbed wire intended to impede the advance of hostile troops. AUXILIARY UNIT OBSERVATION POST CL MILITARY DEFENCE AND FORTIFICATION SN An observation post, usually well concealed, BT ANTI INVASION DEFENCE SITE intended for use by the Auxiliary Units (or British NT DANNERT WIRE Resistance Organisation), in the event of an RT DEFENDED LOCALITY invasion, to watch enemy movements without STOP LINE being seen. BARRACK BLOCK CL MILITARY DEFENCE AND FORTIFICATION BT OBSERVATION POST SN A building used for the accommodation of AUXILIARY UNIT OPERATIONAL BASE members of the armed forces. CL MILITARY DEFENCE AND FORTIFICATION AUXILIARY UNIT OPERATIONAL BASE BT ANCILLARY BUILDING UF Auxiliary Unit Hideout NT SPIDER BILLET Resistance Hideout RT ABLUTIONS BLOCK SN A well concealed structure, usually constructed BARRACKS undergound, intended for use by members of the British Resistance Organization in the event of SN A building used to house members of the armed invasion. forces. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AUXILIARY UNIT SITE BT ANCILLARY BUILDING NT AUXILIARY UNIT BOMB STORE BARRAGE BALLOON CENTRE AUXILIARY UNIT CONTROL STATION AUXILIARY UNIT OBSERVATION POST SN An RAF Base, used specifically for the storage and maintenance of barrage balloons. AUXILIARY UNIT SITE CL MILITARY DEFENCE AND FORTIFICATION SN A site intended for use by the Auxiliary Units (or BT BARRAGE BALLOON SITE British Resistance Organisation) in the event of BARRAGE BALLOON GAS DEPOT an invasion. Use more specific term. CL MILITARY DEFENCE AND FORTIFICATION SN A building or site used for the storage and BT ANTI INVASION DEFENCE SITE distribution lighter than air gases for use in barrage balloons.

9 CL MILITARY DEFENCE AND FORTIFICATION underground it was only intended to be occupied BT BARRAGE BALLOON SITE during an attack. Use more specific type where DEPOT known. CL MILITARY DEFENCE AND FORTIFICATION BARRAGE BALLOON HANGAR BT AIRFIELD DEFENCE SITE SN A hangar used for the storage of barrage NT BATTLE HEADQUARTERS (11008/41) balloons. BATTLE HEADQUARTERS (3329/41) CL MILITARY DEFENCE AND FORTIFICATION BATTLE HEADQUARTERS (11008/41) BT AIRCRAFT HANGAR BARRAGE BALLOON SITE SN A concrete structure, based on drawing number (11008/41), intended to be the headquarters for BARRAGE BALLOON MOORING the coordination of an airfield's defences. SN A mooring, usually consisting of a concrete plinth, Constructed partially underground it was to which a barrage balloon was attached. considered less vulnerable than the (3329/41). CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT BARRAGE BALLOON SITE BT BATTLE HEADQUARTERS BARRAGE BALLOON SHELTER BATTLE HEADQUARTERS (3329/41) SN A building associated with a barrage balloon site SN A structure, based on drawing number and intended to provide shelter for the balloon (3329/41), intended to be the headquarters for crew from air attack. the coordination of an airfield's defences. CL MILITARY DEFENCE AND FORTIFICATION Constructed above ground this design was found BT BARRAGE BALLOON SITE to be vulnerable and was superceded by the BARRAGE BALLOON SITE (11008/41). CL MILITARY DEFENCE AND FORTIFICATION SN A site where a single large balloon was attached BT BATTLE HEADQUARTERS by fine wire cables to the ground to form an aerial obstruction to attacking enemy aircraft. BEACH DEFENCE BATTERY CL MILITARY DEFENCE AND FORTIFICATION SN A battery, usually a single gun often in a pillbox, BT ANTI AIRCRAFT DEFENCE SITE situated so as to provide enfilading fire along a NT BARRAGE BALLOON CENTRE beach to prevent hostile forces from advancing BARRAGE BALLOON GAS DEPOT inland. BARRAGE BALLOON HANGAR CL MILITARY DEFENCE AND FORTIFICATION BARRAGE BALLOON MOORING BT COASTAL BATTERY BARRAGE BALLOON SHELTER BEACH DEFENCE LIGHT BARREL FLAME TRAP SN A searchlight battery used to light a beach. SN An anti-personnel device consisting of a 40 CL MILITARY DEFENCE AND FORTIFICATION gallon fuel drum placed on top of an explosive BT COASTAL DEFENCE SITE charge and detonator. When detonated the barrel RT COAST ARTILLERY SEARCHLIGHT would explode sending burning fuel over the intended target. BEACH SCAFFOLDING CL MILITARY DEFENCE AND FORTIFICATION SN Scaffolding erected on a beach and in the surf so BT PETROLEUM WARFARE SITE as to prevent hostile forces from landing. CL MILITARY DEFENCE AND FORTIFICATION BATTERY ENGINE HOUSE BT ANTI BOAT LANDING OBSTACLE SN A building housing the engines used to power equipment used by a searchlight, anti-aircraft or BELLMAN HANGAR caostal battery. SN A type of temporary transportable aircraft hangar CL MILITARY DEFENCE AND FORTIFICATION designed in 1936 by N.S. Bellman. It was BT ENGINE HOUSE designed for ease of installation, and was RT ANTI AIRCRAFT BATTERY composed of light rolled steel sections. COASTAL BATTERY CL MILITARY DEFENCE AND FORTIFICATION SEARCHLIGHT BATTERY BT AIRCRAFT HANGAR (TRANSPORTABLE) BATTERY OBSERVATION POST BESSONNEAU HANGAR (TYPE H) SN A building used to observe the movements of SN The first transportable aircraft hangar developed hostile aircraft or shipping. by the RFC/RAF, which comprised a kit of timber CL MILITARY DEFENCE AND FORTIFICATION and canvas that could be assembled in 48 hours. BT OBSERVATION POST The canvas doors open one end only. Also ANTI AIRCRAFT BATTERY known as Type H hangar. SEARCHLIGHT BATTERY CL MILITARY DEFENCE AND FORTIFICATION COASTAL BATTERY BT AIRCRAFT HANGAR (TRANSPORTABLE) BATTLE HEADQUARTERS BILLET SN A structure designed to be the headquarters for SN Accommodation for military personnel. the coordination of an airfield's defences. CL MILITARY DEFENCE AND FORTIFICATION Constructed on the surface or partially BT ANCILLARY BUILDING

10 BISON MOBILE PILLBOX have a Visual Control Room . SN A flatbed lorry with a concrete defensive position CL MILITARY DEFENCE AND FORTIFICATION fitted on the back enabling the "pillbox" to be BT CONTROL TOWER driven to where it was most needed in the event BOMBING DECOY SITE of an airborne force landing on the airfield. SN A site comprising a system of lights, controlled CL MILITARY DEFENCE AND FORTIFICATION fires or dummy constructions, used during WWII BT AIRFIELD DEFENCE SITE to provide a counterfeit target for enemy aircraft. PILLBOX Use more specific type where known. BLAST SHELTER CL MILITARY DEFENCE AND FORTIFICATION BT ACTIVE AIR DEFENCE SITE SN A protective structure, often made of sandbags NT DECOY AIRFIELD with reinforcement, designed to protect aircraft at DECOY DOCKS airfields from enemy attack. DECOY DOMESTIC SITE CL MILITARY DEFENCE AND FORTIFICATION DECOY RAILWAY SITE BT AIR RAID SHELTER DECOY SITE SHELTER BLAST WALL K SITE SN A reinforced wall designed to reflect the blast Q SITE from an explosion. Often found associated with QF SITE powder magazines, pillboxes and air raid QL SITE shelters. STARFISH SITE CL MILITARY DEFENCE AND FORTIFICATION BOMBING RANGE BT ANCILLARY BUILDING SN An area of land, with associated buildings and BLISTER HANGAR targets, used for practicing the dropping of SN A type of transportable aircraft hangar patented bombs and other aspects of air warfare. by Miskins and Sons in 1939. The arched hangar CL MILITARY DEFENCE AND FORTIFICATION was constructed of steel or wooden ribs and BT WEAPON TESTING FACILITY generally clad in steel sheets. The hangar did not NT BOMBING RANGE TARGET require any foundations and could be anchored BOMBING RANGE TOWER by iron stakes. RT BOMBING RANGE MARKER CL MILITARY DEFENCE AND FORTIFICATION Bombing Range Direction Arrow BT AIRCRAFT HANGAR (TRANSPORTABLE) USE BOMBING RANGE MARKER BLOODHOUND MISSILE LAUNCH SITE BOMBING RANGE MARKER SN A missile base armed with the Bristol Bloodhound UF Bombing Range Direction Arrow surface-to-air missile. Bloodhounds were SN A range marker allowing bombers to locate the deployed to defend the launch sites of Thor bombing range. Intermediate Range Ballistic Missiles. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION RT BOMBING RANGE BT ACTIVE AIR DEFENCE SITE BOMBING RANGE OBSERVATION POST BOMB CRATER SN An observation post located on or close to a SN A depression in the ground caused by the bombing range. explosion of a mine or bombshell. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT OBSERVATION POST BOMB STORE BOMBING RANGE TARGET SN A complex of buildings and earthworks SN Any structure or object, used for the purpose of constructed the storage of bombs and practice bombing. pyrotechnics. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT BOMBING RANGE BT AMMUNITION STORE BOMBING RANGE TOWER BOMBER SATELLITE STATION WATCH OFFICE SN An observation tower located on or near to a SN A watch office with control room, observation bombing range. room and crew briefing room designed for use on CL MILITARY DEFENCE AND FORTIFICATION Bomber Satellite Stations. BT BOMBING RANGE CL MILITARY DEFENCE AND FORTIFICATION BT CONTROL TOWER BOMBING TEACHER BUILDING NT WATCH OFFICE (13726/41) SN A building equipped with instruments and a flight BOMBER STATION CONTROL TOWER (294/45) simulator used to teach members of bomber crews how to correctly identify targets for UF Very Heavy Bomber Station Control Tower bombing. (294/45) CL MILITARY DEFENCE AND FORTIFICATION SN A control tower designed for use on Very Heavy BT TECHNICAL AND INSTRUCTIONAL SITE Bomber Station Airfields. Designed to Air Ministry drawing number 294/45 they were the first to be BOOM DEFENCE

11 SN A bar, chain or other obstruction stretched CALLENDER HANGAR across a waterway to obstruct navigation. SN A transportable hangar designed by Callender CL MILITARY DEFENCE AND FORTIFICATION Cable and Construction to Air Ministry drawing BT COASTAL DEFENCE SITE number 6633/37. A steel box-girder framework with corrugated iron cladding and canvas doors it BRIDGE had a clear door height of 25ft. SN A structure of wood, stone, iron, brick or CL MILITARY DEFENCE AND FORTIFICATION concrete, etc, with one or more intervals under it BT AIRCRAFT HANGAR (TRANSPORTABLE) to span a river or other space. Use specific type NT CALLENDER HAMILTON HANGAR where known. CALTROP CL MILITARY DEFENCE AND FORTIFICATION BT TRANSPORT SITE SN Blocks of concrete with four protruding arms so that, whichever way up the caltrop is placed, one BRITISH RESTAURANT arm will always point upward. Used in imitation of SN A non-profit making restaurant administered by a the iron caltrops thrown on the ground to impede Local Food Committee which provided customers . with good quality and wholesome food which CL MILITARY DEFENCE AND FORTIFICATION could be purchased without ration coupons. BT ANTI TANK BLOCK CL MILITARY DEFENCE AND FORTIFICATION CAMOUFLAGE BT DOMESTIC SITE SN The surviving remnants of material used to BUFFER DEPOT disguise the existence of a building or site. Use SN A strategic food store, directly operated by, or on with specific monument type where known. behalf of, the government. The stores were used CL MILITARY DEFENCE AND FORTIFICATION to store a variety of foodstuffs. They were in BT MILITARY SITE operation from the end of the Second World War until the early 1990's. CANADIAN PIPE MINE CL MILITARY DEFENCE AND FORTIFICATION UF Mcnaughton Tube BT CIVIL DEFENCE SITE SN A steel pipe driven into the ground at a shallow, DEPOT oblique angle and packed with explosives. They were intended to be detonated on the approach BUNKER of a hostile amroured vehicle or tank in order to SN A bomb-proof structure, usually undergound, create an obstacle directly in its path. used as a command centre for military CL MILITARY DEFENCE AND FORTIFICATION operations. BT DEMOLITION CHARGE SITE CL MILITARY DEFENCE AND FORTIFICATION CENTRE OF RESISTANCE BT ANTI INVASION DEFENCE SITE SN An area, often a village, with fixed defences BUOY such as pillboxes, anti tank ditches and gun SN Blocks of solid concrete, in the shape of a round emplacements, designed to stop the advance of bottomed cone usually 2 feet 6 inches across x 2 an enemy force and to hold out for an agreed feet 9 inches high. Buoys were mainly used in period of time. road blocks intended to impede enemy movement CL MILITARY DEFENCE AND FORTIFICATION in the event of invasion. BT ANTI INVASION DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION CHAIN HOME EXTRA LOW STATION BT ANTI TANK BLOCK SN A radar station with sets operating on a BUTLER COMBAT HANGAR wavelength of 10cm or less. They were highly SN A mutiple role hangar for aircraft and general accurate radars and gave better sea level storage, manufactured in the USA as a kit for on- coverage than the earlier Chain Home Low site assembly during WWII and post-war. It stations. comprises a steel box frame and a canvas CL MILITARY DEFENCE AND FORTIFICATION covering. BT CHAIN HOME STATION CL MILITARY DEFENCE AND FORTIFICATION CHAIN HOME LOW STATION BT AIRCRAFT HANGAR SN A radar station with sets operating on a CABLE wavelength of 1.5m. Chain Home Low Stations SN A cable, usually erected between posts, used to were intended for use in locating low-flying prevent the landing or hostile aircraft. aircraft but was also capable of detecting high- CL MILITARY DEFENCE AND FORTIFICATION flying aircraft. BT ANTI LANDING OBSTACLE CL MILITARY DEFENCE AND FORTIFICATION CALLENDER HAMILTON HANGAR BT CHAIN HOME STATION SN Similar in design to the Callender Hangar but with CHAIN HOME STATION a reduced height of 17ft. Built to Air Ministry SN A radar station using equipment based upon drawing number 17346/40. apparatus developed for ionospheric research. CL MILITARY DEFENCE AND FORTIFICATION Chain Home was the backbone of British radar BT CALLENDER HANGAR provision in the Second World War.

12 CL MILITARY DEFENCE AND FORTIFICATION war. Could also be used during times of national BT RADAR STATION emergency. NT CHAIN HOME EXTRA LOW STATION CL MILITARY DEFENCE AND FORTIFICATION CHAIN HOME LOW STATION BT DEFENCE SITE COAST DEFENCE CHAIN HOME LOW STATION NT AIR RAID PRECAUTIONS SITE AIR RAID SHELTER CHECKPOINT BUFFER DEPOT SN A roadblock, usually manned by the Home Guard, CIVIL DEFENCE BUILDING where the credentials of civilians and military CIVIL DEFENCE TRAINING GROUND personnel where checked before allowing them NUCLEAR BUNKER to proceed. ROYAL OBSERVER CORPS SITE CL MILITARY DEFENCE AND FORTIFICATION CIVIL DEFENCE TRAINING CENTRE BT ANTI INVASION DEFENCE SITE SN A building or site used to train civilians and CHEMICAL WEAPONS STORE members of the services in the skills designed to SN A protected building or site used for the safe protect the civilian population during times of war. storage of chemical weapons. Could also be used during times of national CL MILITARY DEFENCE AND FORTIFICATION emergency. BT STORAGE FACILITY CL MILITARY DEFENCE AND FORTIFICATION CHIEF INSTRUCTORS BLOCK (5740/36) BT CIVIL DEFENCE BUILDING TRAINING CENTRE SN A central tower with a single-storey wing either side. The tower contained the watch office on CIVIL DEFENCE TRAINING GROUND the ground floor, observation room on the second SN An area used for the training of personnel in civil with each wing containing an office for the Chief defence procedures. Flying Instructor or the officer commanding and CL MILITARY DEFENCE AND FORTIFICATION their aides. BT CIVIL DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION CLOSE DEFENCE BATTERY BT CONTROL TOWER SN A coastal battery designed for use in short range CINEMA engagements with enemy vessels, minelayers, SN A building equipped with a large screen and film blockships ad torpedo craft. projectors where service personnel could watch CL MILITARY DEFENCE AND FORTIFICATION films. BT COAST ARTILLERY BATTERY CL MILITARY DEFENCE AND FORTIFICATION COAST ARTILLERY BATTERY BT DOMESTIC SITE SN A defensive battery positioned facing out to sea CIVIL DEFENCE BUILDING enabling the guns to be brought to bear on enemy SN A building used to coordinate civil defence in shipping and amphibious craft. times of war. Can also be utilized as aid centres CL MILITARY DEFENCE AND FORTIFICATION in times of national emergency. BT COASTAL BATTERY CL MILITARY DEFENCE AND FORTIFICATION NT ANTI MOTOR TORPEDO BOAT BATTERY BT CIVIL DEFENCE SITE CLOSE DEFENCE BATTERY NT CIVIL DEFENCE GARAGE COUNTER BOMBARDMENT BATTERY CIVIL DEFENCE HEADQUARTERS EMERGENCY COAST DEFENCE BATTERY CIVIL DEFENCE TRAINING CENTRE COAST ARTILLERY SEARCHLIGHT EMERGENCY PLANNING CENTRE FIRE SERVICE HEADQUARTERS SN A searchlight battery, which faces out to sea, REGIONAL GOVERNMENT HEADQUARTERS used to locate and illuminate enemy shipping. REGIONAL SEAT OF GOVERNMENT CL MILITARY DEFENCE AND FORTIFICATION WAR ROOM BT COASTAL DEFENCE SITE RT BEACH DEFENCE LIGHT CIVIL DEFENCE GARAGE COASTAL BATTERY SN A garage for the storage and maintenance of LYON LIGHT EMPLACEMENT motor vehicles, such as ambluances and fire engines, used for civil defence purposes. COAST BATTERY GUN SITE CL MILITARY DEFENCE AND FORTIFICATION SN A gun emplacement associated with a coastal BT CIVIL DEFENCE BUILDING battery. CL MILITARY DEFENCE AND FORTIFICATION CIVIL DEFENCE HEADQUARTERS BT COASTAL BATTERY SN A building used for the daily administration of Civil Defence activities. COAST DEFENCE CHAIN HOME LOW STATION CL MILITARY DEFENCE AND FORTIFICATION SN A radar station with sets operating on a BT CIVIL DEFENCE BUILDING wavelenght of 1.5m established to provide radar plotting of both shipping and aircraft movements. CIVIL DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION SN Sites and buildings used in the coordination of the BT CHAIN HOME STATION defence of the civilian population during times of COASTAL BATTERY

13 SN A site including artillery pieces and associated term where known. structures directed out to sea to engage enemy CL MILITARY DEFENCE AND FORTIFICATION shipping and defend the coastline. Use more BT ANCILLARY BUILDING specific term where known. NT ANTI AIRCRAFT BATTERY COMMAND POST CL MILITARY DEFENCE AND FORTIFICATION COASTAL BATTERY COMMAND POST BT COASTAL DEFENCE SITE RT DEFENDED LOCALITY NT BATTERY OBSERVATION POST COMMUNICATION TRENCH BEACH DEFENCE BATTERY COAST ARTILLERY BATTERY SN A trench, usually linking two or more rows of COAST BATTERY GUN SITE trenches, enabling the conveyance of messages COASTAL BATTERY COMMAND POST or equipment safely from one trench to another. RT BATTERY ENGINE HOUSE CL MILITARY DEFENCE AND FORTIFICATION COAST ARTILLERY SEARCHLIGHT BT TRENCH DANNERT WIRE COMMUNICATIONS BUILDING LYON LIGHT EMPLACEMENT SN A building associated with the transmission and COASTAL BATTERY COMMAND POST gathering of information. SN A command post used to direct the guns of a CL MILITARY DEFENCE AND FORTIFICATION coastal battery. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION NT GROUP FILTER ROOM BT COMMAND POST RADIO STATION COASTAL BATTERY SIGNALS GATHERING STATION COASTAL DEFENCE SITE CONE SN A defence site used to defend against emeny SN Cones of solid concrete usually 3 feet 6 inches in shipping or invasion attempts. Use more specific diameter x 2 feet high which, when placed in term. rows or groups were intended to form a CL MILITARY DEFENCE AND FORTIFICATION substantial barrier to enemy armoured divisions in BT DEFENCE SITE the event of invasion. NT ANTI BOAT LANDING OBSTACLE CL MILITARY DEFENCE AND FORTIFICATION BEACH DEFENCE LIGHT BT ANTI TANK BLOCK BOOM DEFENCE CONSOL SHELTER COAST ARTILLERY SEARCHLIGHT COASTAL BATTERY SN A small, steel shelter designed for use as a COASTAL FORT firewatchers post during an air raid. COASTAL OBSERVATION POST CL MILITARY DEFENCE AND FORTIFICATION EXTENDED DEFENCE OFFICERS POST BT AIR RAID SHELTER MINEFIELD CONTROL BUILDING SUBMARINE MINE ESTABLISHMENT SN A building from which the fire of a Coastal or Anti TORPEDO STATION Aircraft battery was directed. COASTAL FORT CL MILITARY DEFENCE AND FORTIFICATION SN A fortification constructed either on the coast, or BT TECHNICAL SITE in the middle of a stretch of water, designed to CONTROL TOWER protect a port or river from enemy incursion. SN A building at an airfield from which air traffic can CL MILITARY DEFENCE AND FORTIFICATION be controlled, usually by radio. BT COASTAL DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION COASTAL OBSERVATION POST BT AIRFIELD SITE SN A building, situated on the coast, used for NT BOMBER SATELLITE STATION WATCH OFFICE observing the movements of shipping. BOMBER STATION CONTROL TOWER (294/45) CL MILITARY DEFENCE AND FORTIFICATION CHIEF INSTRUCTORS BLOCK (5740/36) BT OBSERVATION POST DUTY PILOTS OFFICE (2072/26) COASTAL DEFENCE SITE FIGHTER SATELLITE STATION WATCH OFFICE NT MINEWATCHERS POST NIGHT FIGHTER STATION WATCH OFFICE ROYAL NAVAL AIR STATION CONTROL COFFIN TOWER SN Rectangular slabs of concrete with a sloping top TRAINING SCHOOL WATCH OFFICE usually with sides of 5 feet by 3 feet and 3 feet WATCH OFFICE high which when placed in rows were intended WATCH OFFICE WITH OPERATIONS ROOM to form a substantial barrier to enemy armoured CONTROL TOWER (3860/42) divisions in the event of invasion. CL MILITARY DEFENCE AND FORTIFICATION SN A three-storey RNAS control tower, incorporating BT ANTI TANK BLOCK meteorological office on the ground floor and an air watch office on the second floor. COMMAND POST CL MILITARY DEFENCE AND FORTIFICATION SN A building used for directing the movements of BT ROYAL NAVAL AIR STATION CONTROL TOWER artillery pieces or searchlights. Use more specific CONTROL TOWER (566/42)

14 SN A four-storey RNAS control tower. The first floor BT BOMBING DECOY SITE contained offices for the commander flying and DECOY DOMESTIC SITE meteorological offices and the upper two floors, in the form of a central tower, provided offices SN A system of lights, controlled fires or dummy for air traffic control. constructions, used to simulate a domestic site CL MILITARY DEFENCE AND FORTIFICATION such as a city and thus confuse enemy aircraft BT ROYAL NAVAL AIR STATION CONTROL TOWER into bombing counterfeit targets. CL MILITARY DEFENCE AND FORTIFICATION Counter Balance Fort BT BOMBING DECOY SITE USE PICKETT HAMILTON FORT DECOY RAILWAY SITE COUNTER BOMBARDMENT BATTERY SN A system of lights, controlled fires or dummy SN A coastal battery used for delivering fire at long constructions, used to simulate a railway yard or distance thus forcing a threatening or sidings and thus confuse enemy aircraft into bombarding shore installations to withdraw out of bombing these counterfeit targets. range. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT BOMBING DECOY SITE BT COAST ARTILLERY BATTERY DECOY SITE SHELTER Croft Pillbox SN Partly subterranean operations rooms for the USE PILLBOX (TYPE PD541) lighting arrays of the various types of bombing decoys in use during the Second World War. CUBE CL MILITARY DEFENCE AND FORTIFICATION SN Cubes of solid concrete, usually with sides of 3 BT BOMBING DECOY SITE feet 6 inches or 5 feet which when placed in NT Q SITE SHELTER (3395/40) rows were intended to form a substantial barrier Q SITE SHELTER (367/41) to enemy armoured divisions in the event of invasion. DEFENCE LINE CL MILITARY DEFENCE AND FORTIFICATION SN A system of defensive works such as anti-tank BT ANTI TANK BLOCK obstacles, ditches and pillboxes, designed to stop the advance of an enemy. Defence lines were CYLINDER constructed across and around strategic areas SN Blocks of solid concrete, in the form of cylinders of ground and sites such as industrial towns. usually 2 feet across x 2 feet 6 inches or 3 feet CL MILITARY DEFENCE AND FORTIFICATION high. Cylinders were mainly used in road blocks BT DEFENCE SITE intended to impede enemy movement in the event of invasion. DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION SN Sites, buildings and structures involved in the BT ANTI TANK BLOCK passive or active defence of the country against hostile forces on land, sea and in the air. Use DANNERT WIRE more specific term. SN Barbed wire in the form of a coil which could be CL MILITARY DEFENCE AND FORTIFICATION extended concertina-like to form a barrier to NT AIR DEFENCE SITE impede the movement of hostile troops. AIRFIELD DEFENCE SITE CL MILITARY DEFENCE AND FORTIFICATION ANCILLARY BUILDING BT BARBED WIRE ENTANGLEMENT ANTI INVASION DEFENCE SITE RT COASTAL BATTERY CIVIL DEFENCE SITE DECONTAMINATION BUILDING COASTAL DEFENCE SITE DEFENCE LINE UF Gas Decontamination Centre DEFENCE WORK SN A building used for the treatment of victims of EARLY WARNING SITE chemical, gas or other forms of contamination. WEAPON TESTING FACILITY CL MILITARY DEFENCE AND FORTIFICATION BT DOMESTIC SITE DEFENCE WORK DECOY AIRFIELD SN Sites, buildings or structures believed to be associated with defence but unidentifiable as SN A system of lights, controlled fires or dummy specific monument types. constructions, used to simulate an airfield and CL MILITARY DEFENCE AND FORTIFICATION thus confuse enemy aircraft into bombing these BT DEFENCE SITE counterfeit targets. CL MILITARY DEFENCE AND FORTIFICATION DEFENDED BUILDING BT BOMBING DECOY SITE SN A building which has been altered to increase its DECOY DOCKS defensive characteristics. Use more specific term where known. SN A system of lights, controlled fires or dummy CL MILITARY DEFENCE AND FORTIFICATION constructions, used to simulate a dockyard and BT DEFENDED LOCALITY thus confuse enemy aircraft into bombing these NT counterfeit targets. LOOPHOLED WALL CL MILITARY DEFENCE AND FORTIFICATION

15 SECTION POST FOOD DEPOT RT DEFENDED LOCALITY FUEL DEPOT STOP LINE ORDNANCE DEPOT REMOUNT DEPOT Defended House ROYAL NAVAL DEPOT USE FORTIFIED HOUSE STORAGE DEPOT DEFENDED LOCALITY SUPPLY DEPOT VEHICLE DEPOT SN An area, with fixed defences, designed to act as DINGHY SHED (2900/43) a focal point for a defending force. CL MILITARY DEFENCE AND FORTIFICATION SN A modified Nissen hut, based on drawing number BT ANTI INVASION DEFENCE SITE (2900/43), used for the repair packing and NT DEFENDED BUILDING storage of inflatable liferafts. HOME GUARD HEADQUARTERS CL MILITARY DEFENCE AND FORTIFICATION HOME GUARD OBSERVATION POST BT STORAGE FACILITY HOME GUARD SHELTER DINGHY SHED (2901/43) HOME GUARD STORE SN A temporary brick building, based on drawing number (2901/43), used for the repair, packing NODAL POINT and storage of inflatable liferafts. STRONGPOINT CL MILITARY DEFENCE AND FORTIFICATION RT ANTI LANDING OBSTACLE BT STORAGE FACILITY ANTI TANK GUN EMPLACEMENT ANTI TANK OBSTACLE DISPERSAL PEN BARBED WIRE ENTANGLEMENT SN An area of hardstanding, surrounded on three COMMAND POST sides by a protective wall or bank, used for DEFENDED BUILDING parking aircraft, in a state of readiness, usually DEMOLITION CHARGE SITE around the perimeter of an airfield. FIELDWORK CL MILITARY DEFENCE AND FORTIFICATION LYON LIGHT EMPLACEMENT BT AIRFIELD SITE PETROLEUM WARFARE SITE PILLBOX DISPERSED SITE RAILBLOCK SN Accommodation and facilities for aircrew away ROADBLOCK from the main RAF airfield. SPIGOT MORTAR EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION STOP LINE BT AIRFIELD SITE DEMOLITION CHAMBER DOMESTIC SITE SN A chamber built into a structure, such as a SN Buildings used for the accommodation, welfare bridge, in which an explosive, demolition charge and recreation of servicemen, especially those could be placed. The charge could then be serving in the Royal Air Force. inserted in the event of an invasion. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION NT ACCESS HOLE BT DEMOLITION CHARGE SITE BRITISH RESTAURANT DEMOLITION CHARGE SITE CINEMA DECONTAMINATION BUILDING SN A site used for the placing of an explosive, EVACUEE CENTRE demolition charge. Many types of structures FOOD AND REST CENTRE were prepared for demolition in the event of an GYMNASIUM invasion in order to cause the maximum disruption MEDICAL BLOCK to the advance of hostile forces. Use more PARADE GROUND specifc type where known. SICK QUARTERS CL MILITARY DEFENCE AND FORTIFICATION SIGNAL SQUARE BT ANTI INVASION DEFENCE SITE SQUASH RACQUETS COURT NT CANADIAN PIPE MINE TENNIS COURT DEMOLITION CHAMBER WOMENS LAND ARMY CAMP MINED BRIDGE WOMENS LAND ARMY HOSTEL MINED ROAD RT DEFENDED LOCALITY Dragons Teeth STOP LINE USE PIMPLE DEPOT Drem Type Flarepath Site SN A building or site used as a storage and USE Q SITE distribution centre. DRILL HALL CL MILITARY DEFENCE AND FORTIFICATION BT STORAGE FACILITY SN A building or site used for the exercise and NT AMMUNITION DEPOT training of military personnel. BARRAGE BALLOON GAS DEPOT CL MILITARY DEFENCE AND FORTIFICATION BUFFER DEPOT BT REGIMENTAL HEADQUARTERS

16 DRYING TOWER (11595/42) EMBARKATION HARD SN A purpose-built building with a steel framed SN Special concrete loading ramps nicknamed 'hards' tower, based on drawing number (11595/42). had been constructed along river banks, beaches Used for the drying of parachutes. and inlets to enable orgainised embarkation onto CL MILITARY DEFENCE AND FORTIFICATION various types of to take place, BT TECHNICAL AND INSTRUCTIONAL SITE irrespective of tides. CL MILITARY DEFENCE AND FORTIFICATION DRYING TOWER (9290/42) BT EMBARKATION POINT SN A brick tower, based on drawing number (9290/42), usually added to an existing building. EMBARKATION POINT Used for the drying of parachutes. SN A site from which troops could be embarked onto CL MILITARY DEFENCE AND FORTIFICATION transport vessels prior to the D-Day lndaings. BT TECHNICAL AND INSTRUCTIONAL SITE CL MILITARY DEFENCE AND FORTIFICATION NT EMBARKATION BEACH DRYING TOWER (9294/42) EMBARKATION HARD SN A purpose-built building with a brick tower EMERGENCY COAST DEFENCE BATTERY constructed on one end, based on drawing number (9294/42). Used for the drying of SN A coastal battery constructed at short notice parachutes. usually mounting a variety of artillery pieces. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT TECHNICAL AND INSTRUCTIONAL SITE BT COAST ARTILLERY BATTERY RT LYON LIGHT EMPLACEMENT Dummy Landing Ground (Day) EMERGENCY LANDING GROUND USE K SITE SN A prepared area of cleared ground on which an Dummy Landing Ground (Night) aircraft could make an emergency landing. USE Q SITE CL MILITARY DEFENCE AND FORTIFICATION Dummy Pillbox BT AIRFIELD USE PILLBOX (ASSAULT TRAINING) EMERGENCY PLANNING CENTRE DUTY PILOTS OFFICE (2072/26) SN A structure, building or room within a building, used by a local authority for the continuance of SN The first standardized design for a building for local government in the event of a military or civil the duty pilot. It took the form of a small bungalow emergency. with a bay window on the front elevation. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT CIVIL DEFENCE BUILDING BT CONTROL TOWER EMERGENCY STORE EARLY WARNING SITE CL MILITARY DEFENCE AND FORTIFICATION SN A site, building or structure used for the detection BT STORAGE FACILITY of approaching hostile aircraft, shipping or missiles early enough to allow a counterattack or EMERGENCY WAR HEADQUARTERS defensive measures to be taken. Use more SN A site, complex or building which has been specific term. converted for use as the headquarters for the CL MILITARY DEFENCE AND FORTIFICATION civilian authorities in the event of a nuclear attack BT DEFENCE SITE or major natural disaster destroying the seat of NT ANTENNA ARRAY government. EARLY WARNING STATION CL MILITARY DEFENCE AND FORTIFICATION ROYAL OBSERVER CORPS SITE BT HEADQUARTERS SONAR STATION SOUND MIRROR ENGINE HOUSE SOUND MIRROR BUILDING SN A building housing an engine used to run EARLY WARNING STATION electrical equipment. Use more specific type where known. SN A complex of buildings using Radar or satellite CL MILITARY DEFENCE AND FORTIFICATION tracking to monitor and detect enemy missile BT ANCILLARY BUILDING launches early enough to allow a counterattack NT BATTERY ENGINE HOUSE or defensive measures to be taken. CL MILITARY DEFENCE AND FORTIFICATION EVACUEE CENTRE BT EARLY WARNING SITE SN A building or site used to co-ordinate the NT RADAR STATION movement and housing of evacuees. RADIO TELEGRAPHY STATION CL MILITARY DEFENCE AND FORTIFICATION EMBARKATION BEACH BT DOMESTIC SITE SN Beaches used for the departure of troops and EXPLOSIVES STORAGE FACILITY equipment for the D-day landings. SN A site, building or structure used for the storage CL MILITARY DEFENCE AND FORTIFICATION of explosives. BT EMBARKATION POINT CL MILITARY DEFENCE AND FORTIFICATION BT STORAGE FACILITY

17 NT PYROTECHNIC STORE (2647/37) SN A building, on an airfield, used to house a fire engine designed to Air Ministry drawing number EXTENDED DEFENCE OFFICERS POST 5342/42. SN An observation post for a naval officer in charge CL MILITARY DEFENCE AND FORTIFICATION of a marine minefield. BT FIRE TENDER HOUSE CL MILITARY DEFENCE AND FORTIFICATION BT COASTAL DEFENCE SITE FIRE TRENCH RT MINEFIELD SN A trench cut around a building or structure to prevent the spread of fire. FIELDWORK CL MILITARY DEFENCE AND FORTIFICATION SN A usually temporary earthwork or fortification, BT TRENCH constructed by military forces operating in the field. Use more specific type where known. FIREWATCHERS POST CL MILITARY DEFENCE AND FORTIFICATION SN A building or structure used to provide protection BT ANTI INVASION DEFENCE SITE to an Air Raid Warden or firewatcher during an NT INFANTRY POST air raid, thus enabling the identification of the RIFLE PIT locations of fires caused by incendiary bombs in TRENCH comparative safety. WEAPONS PIT CL MILITARY DEFENCE AND FORTIFICATION RT ANTI LANDING OBSTACLE BT AIR RAID PRECAUTIONS SITE DEFENDED LOCALITY FIRING RANGE STOP LINE SN A piece of ground, or a building, where small FIGHTER COMMAND STATION arms or large artillery may be fired at targets. For SN An airfield, and associated structures, used by rocket and missile firing use ROCKET TEST one or more fighter squadrons. FACILITY. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ACTIVE AIR DEFENCE SITE BT WEAPON TESTING FACILITY TRAINING AREA FIGHTER SATELLITE STATION WATCH OFFICE NT FIRING RANGE SN A small single storey structure with just one room NAVAL GUNNERY RANGE containing a pyrotechnic cupboard and built of TARGET RANGE rendered brick with a flat reinforced concrete TORPEDO RANGE roof. CL MILITARY DEFENCE AND FORTIFICATION FIRING RANGE BLOCKHOUSE BT CONTROL TOWER UF Firing Range Shelter NT WATCH OFFICE (14383/40) SN A shelter on a firing range from which the WATCH OFFICE (17658/40) wepaons testing can be viewed in safety. WATCH OFFICE (18441/40) CL MILITARY DEFENCE AND FORTIFICATION WATCH OFFICE (3156/41) BT FIRING RANGE FIRE SERVICE HEADQUARTERS Firing Range Shelter SN A building, either purpose-built or modified, used USE FIRING RANGE BLOCKHOUSE for the co-ordination of the Fire Service. FOOD AND REST CENTRE CL MILITARY DEFENCE AND FORTIFICATION BT CIVIL DEFENCE BUILDING CL MILITARY DEFENCE AND FORTIFICATION BT DOMESTIC SITE FIRE STATION FOOD DEPOT SN A building housing fire engines, and equipment and a permanent fire-fighting force. SN A building or site used for the storage and CL MILITARY DEFENCE AND FORTIFICATION distribution of food. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION BT DEPOT FIRE TENDER HOUSE FORTIFIED HOUSE SN A building, on an airfield, used to house a fire engine. UF Defended House CL MILITARY DEFENCE AND FORTIFICATION Loopholed House BT TECHNICAL AND INSTRUCTIONAL SITE SN A house which bears signs of fortification often NT FIRE TENDER HOUSE (12563/40) including the addition of loopholes. FIRE TENDER HOUSE (5342/42) CL MILITARY DEFENCE AND FORTIFICATION BT DEFENDED BUILDING FIRE TENDER HOUSE (12563/40) FOUGASSE SN A building, on an airfield, used to house a fire engine designed to Air Ministry drawing number SN A pit filled with rocks and metal, designed to be 12563/40. fired with an explosive charge. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT FIRE TENDER HOUSE BT PETROLEUM WARFARE SITE FIRE TENDER HOUSE (5342/42) FROMSON HANGAR

18 SN A small arched hangar built by the Canadian plotting and monitoring nuclear fallout. company Fromson of Byfleet to drawing number CL MILITARY DEFENCE AND FORTIFICATION 3971/43. Used only as storage sheds on RNASs. BT ROYAL OBSERVER CORPS SITE CL MILITARY DEFENCE AND FORTIFICATION Guard Room BT AIRCRAFT HANGAR (TRANSPORTABLE) NT FROMSON MASSILLON HANGAR USE GUARDHOUSE FROMSON MASSILLON HANGAR GUARDHOUSE SN Similar in design to the FROMSON HANGAR but UF Guard Room designed to drawing number 3752/43 and used SN A building used for the accommodation of a for storing aircraft with small wingspans. military guard and/or the detainment of prisoners. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT FROMSON HANGAR BT ANCILLARY BUILDING FUEL DEPOT GUN EMPLACEMENT SN A building or site used for the storage and SN A fortified site in which a gun, mortar or cannon distribution of fuel. is positioned. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT DEPOT BT ANTI INVASION DEFENCE SITE NT ANTI AIRCRAFT GUN EMPLACEMENT FUEL STORE ANTI TANK GUN EMPLACEMENT SN A building used for the storage of materials used GUN EMPLACEMENT (TYPE 55414) to provide power or heat. GUN EMPLACEMENT (TYPE 55415) CL MILITARY DEFENCE AND FORTIFICATION GUN EMPLACEMENT (TYPE 55422) BT STORAGE FACILITY GUN EMPLACEMENT (TYPE 55483) NT FUEL TANK GUN EMPLACEMENT (TYPE 55491) GUN EMPLACEMENT (TYPE 55503) FUEL TANK HOLDFAST SN A large, usually metal, container used for the MACHINE GUN EMPLACEMENT storage of liquid fuels. GUN EMPLACEMENT (TYPE 55414) CL MILITARY DEFENCE AND FORTIFICATION BT FUEL STORE SN A gun emplacement which conforms to Department of Fortification and Works drawing GARAGE number 55422.A fortified site in which a gun, SN A building used for the storage and maintenance mortar or cannon is positioned and which of motor vehicles. conforms to Department of Fortification and CL MILITARY DEFENCE AND FORTIFICATION Works drawing number 55414. BT MOTOR TRANSPORT BUILDING CL MILITARY DEFENCE AND FORTIFICATION Gas Decontamination Centre BT GUN EMPLACEMENT USE DECONTAMINATION BUILDING GUN EMPLACEMENT (TYPE 55415) GENERATOR HOUSE SN A gun emplacement which conforms to Department of Fortification and Works drawing SN A building housing a generator used to power number 55422. fortified site in which a gun, electrical equipment. mortar or cannon is positioned and which CL MILITARY DEFENCE AND FORTIFICATION conforms to Department of Fortification and BT ANCILLARY BUILDING Works drawing number 55415. RANGE CL MILITARY DEFENCE AND FORTIFICATION BT GUN EMPLACEMENT SN An area of ground where training in the use of can be carried out. GUN EMPLACEMENT (TYPE 55422) CL MILITARY DEFENCE AND FORTIFICATION SN A gun emplacement which conforms to BT WEAPON TESTING FACILITY Department of Fortification and Works drawing TRAINING AREA number 55422. GROUP FILTER ROOM CL MILITARY DEFENCE AND FORTIFICATION BT GUN EMPLACEMENT SN A building, often built underground, used to filter and analyse information received from radar GUN EMPLACEMENT (TYPE 55483) stations and observation posts relating to enemy SN A gun emplacment which conforms to aircraft thus enabling a fighter group to mobilize Department of Fortification and Works drawing more effectively to counter the threat, number 55483. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT COMMUNICATIONS BUILDING BT GUN EMPLACEMENT GROUP HEADQUARTERS GUN EMPLACEMENT (TYPE 55491) SN A building used by the Royal Observer Corps as SN A gun emplacment which conforms to a headquarters and reporting centre. It may also Department of Fortification and Works drawing fulfil an observation and nuclear fallout monitoring number 55491. role. Use term to describe headquarters for

19 CL MILITARY DEFENCE AND FORTIFICATION Guard during the Second World War. BT GUN EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING GUN EMPLACEMENT (TYPE 55503) DEFENDED LOCALITY SN A gun emplacment which conforms to RT HOME GUARD SHELTER Department of Fortification and Works drawing number 55503. HOME GUARD OBSERVATION POST CL MILITARY DEFENCE AND FORTIFICATION SN An observation post used by members of the BT GUN EMPLACEMENT Home Guard. CL MILITARY DEFENCE AND FORTIFICATION GUN LAYING RADAR PLATFORM BT ANCILLARY BUILDING SN A platform, usually in concrete, on which radar OBSERVATION POST equipment was mounted to assist the targetting DEFENDED LOCALITY of artillery guns. The platform is often the only evidence surviving in the landscape. HOME GUARD SHELTER CL MILITARY DEFENCE AND FORTIFICATION SN A structure, often concrete or brick, used as a BT HEAVY ANTI AIRCRAFT BATTERY shelter by members of the British citizen army during watch or patrol duties, or air raids, in GUN STORE wartime. SN A building used for the storage of artillery pieces. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING BT HEAVY ANTI AIRCRAFT BATTERY DEFENDED LOCALITY GYMNASIUM RT HOME GUARD HEADQUARTERS SN A building or room, originally equipped for HOME GUARD STORE gymnastics or indoor sports but also, more SN Place for the Home Guard to store equipment and recently, equipped with cross-training machines amunition, either structural or subterranean and free-weights for members to improve their during the defence of Britain. physical fitness. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING BT DOMESTIC SITE DEFENDED LOCALITY HEADQUARTERS In Line Type Flarepath Site SN A building used for the daily administration of an USE Q SITE organisation or military force. INFANTRY POST CL MILITARY DEFENCE AND FORTIFICATION NT EMERGENCY WAR HEADQUARTERS UF Rifle Post NUCLEAR COMMAND CENTRE SN A defensive position, often constructed from sandbags, designed to protect a group of HEAVY ANTI AIRCRAFT BATTERY infantry. SN An anti aircraft battery usually mounting CL MILITARY DEFENCE AND FORTIFICATION weapons with a larger calibre ammunition such BT FIELDWORK as the QF 3.75 inch (94mm) gun. INSTRUCTIONAL SITE CL MILITARY DEFENCE AND FORTIFICATION BT ANTI AIRCRAFT BATTERY SN A site used to train military personnel in the use NT GUN LAYING RADAR PLATFORM of equipment. GUN STORE CL MILITARY DEFENCE AND FORTIFICATION MAGAZINE BT TECHNICAL AND INSTRUCTIONAL SITE Hedgehog K SITE USE ANTI TANK VERTICAL RAIL UF Dummy Landing Ground (Day) SN A decoy site designed to replicate the layout of HINAIDI AIRCRAFT SHED an RAF satellite airfield, complete with dummy SN A semi-permanent ahed designed to Air Ministry aircraft, simulated runways and simple structures specification 1136/27 as a quick and cheap intended to fool enemy aircraft during daylight hangar for stations overseas raids. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AIRCRAFT HANGAR BT BOMBING DECOY SITE HOLDFAST KEEP SN A plinth or pedestal, usually of concrete, to which SN An existing building which has been designated an anti aircraft or coastal battery gun was fitted. as the last point of defence in a defended locality, Holdfasts are often the only evidence for a nodal point or centre of resistance. If all else weapon which survive. failed the keep would be used as a last ditch CL MILITARY DEFENCE AND FORTIFICATION defences. BT GUN EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION HOME GUARD HEADQUARTERS BT DEFENDED LOCALITY SN A building used as the headquarters for the Home

20 Lamella Aircraft Storage Shed CL MILITARY DEFENCE AND FORTIFICATION USE LAMELLA HANGAR BT ANTI INVASION DEFENCE SITE RT COAST ARTILLERY SEARCHLIGHT LAMELLA HANGAR COASTAL BATTERY UF Lamella Aircraft Storage Shed DEFENDED LOCALITY SN A steel aircraft hangar evolved from the German EMERGENCY COAST DEFENCE BATTERY "Lamellendach", a segmental roof design of the SEARCHLIGHT BATTERY 1920s using a diamond shaped web of pressed STOP LINE steel producing a hangar with a shallow curving profile. Used for both military and civil purposes. MACHINE GUN EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION SN A structure, usually or concrete or sandbags, in BT AIRCRAFT HANGAR which a machine gun was emplaced. CL MILITARY DEFENCE AND FORTIFICATION LIGHT ANTI AIRCRAFT BATTERY BT GUN EMPLACEMENT SN An anti aircraft battery usually mounting smaller, NT MACHINE GUN POST faster weapons such as Bofors guns, intended VICKERS MACHINE GUN EMPLACEMENT to engage fast low flying aircraft. CL MILITARY DEFENCE AND FORTIFICATION MACHINE GUN POST BT ANTI AIRCRAFT BATTERY SN An open walled structure built of concrete, brick NT ANTI AIRCRAFT GUN POST or sandbags which enclosed one or more PILLBOX (TYPE FW3/23) machine-guns mounted on pintels for light anti- PILLBOX (TYPE FW3/27) aircraft and ground defence. CL MILITARY DEFENCE AND FORTIFICATION LINK TRAINER BT MACHINE GUN EMPLACEMENT SN A building containing a flight siumlator used to provide safe training for pilots. MAGAZINE CL MILITARY DEFENCE AND FORTIFICATION SN A building in which a supply of arms, ammunition BT TECHNICAL AND INSTRUCTIONAL SITE and provisions for an army is stored. NT LINK TRAINER (10040/41) CL MILITARY DEFENCE AND FORTIFICATION LINK TRAINER (1762/39) BT HEAVY ANTI AIRCRAFT BATTERY LINK TRAINER (4188/42) MAIN HANGAR LINK TRAINER (7790/40) SN A transportable hangar designed by A & J Main LINK TRAINER (10040/41) of Glasgow. SN A building housing a flight simulator designed to CL MILITARY DEFENCE AND FORTIFICATION air ministry drawing number 10040/41. BT AIRCRAFT HANGAR (TRANSPORTABLE) CL MILITARY DEFENCE AND FORTIFICATION Mcnaughton Tube BT LINK TRAINER USE CANADIAN PIPE MINE LINK TRAINER (1762/39) MEDICAL BLOCK SN A building housing a flight simulator designed to air ministry drawing number 1762/39. SN A building, usually part of a complex, where CL MILITARY DEFENCE AND FORTIFICATION medical treatment and hospital facilities are BT LINK TRAINER provided. CL MILITARY DEFENCE AND FORTIFICATION LINK TRAINER (4188/42) BT DOMESTIC SITE SN A building housing a flight simulator designed to MESS air ministry drawing number 4188/42. CL MILITARY DEFENCE AND FORTIFICATION SN A building providing dining and recreation facilities BT LINK TRAINER for military personnel. CL MILITARY DEFENCE AND FORTIFICATION LINK TRAINER (7790/40) BT ANCILLARY BUILDING SN A building housing a flight simulator designed to NT OFFICERS MESS air ministry drawing number 7790/40. SERGEANTS MESS CL MILITARY DEFENCE AND FORTIFICATION MILITARY BASE BT LINK TRAINER SN A building or group of buildings, often surrounded Loopholed House by a system of , used as a USE FORTIFIED HOUSE residential and training site by members of an armed force. LOOPHOLED WALL CL MILITARY DEFENCE AND FORTIFICATION SN A wall containing apertures to allow a weapon to NT AIR SEA RESCUE STATION be fired through it. AMPHIBIOUS BASE CL MILITARY DEFENCE AND FORTIFICATION ROYAL AIR FORCE BASE BT DEFENDED BUILDING ROYAL NAVAL BASE LYON LIGHT EMPLACEMENT SPECIAL OPERATIONS EXECUTIVE BASE TRAINING BASE SN An emplacement mounting a small, portable electrically-powered searchlight. MILITARY BUILDING

21 SN A building of unknown purpose found at a military CL MILITARY DEFENCE AND FORTIFICATION site. Use more specific type where known. NT CAMOUFLAGE CL MILITARY DEFENCE AND FORTIFICATION ROYAL NAVAL AIR STATION SEAPLANE STATION MILITARY CAMP SN A site where a body of troops is temporarily or MINED BRIDGE permanently lodged, with or without SN A bridge which has had mines placed within its entrenchments and fortifications. structure to enable it to be destroyed in the event CL MILITARY DEFENCE AND FORTIFICATION of an invasion. NT ARMY CAMP CL MILITARY DEFENCE AND FORTIFICATION ROYAL AIR FORCE CAMP BT DEMOLITION CHARGE SITE TRAINING CAMP MINED ROAD WOMENS AUXILIARY AIR FORCE CAMP SN A road which has had mines placed within its MILITARY DEFENCE AND FORTIFICATION structure to enable it to be destroyed in the event SN This is the top term for the thesaurus see Class of an invasion. List for Narrower Terms. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT DEMOLITION CHARGE SITE NT ADMIRALTY SIGNAL ESTABLISHMENT MINEFIELD ADMIRALTY SIGNAL STATION AIRCRAFT CRASH SITE SN An area of ground or water containing explosive AIRSHIP STATION mines. AUXILIARY FIRE STATION CL MILITARY DEFENCE AND FORTIFICATION AUXILIARY HOSPITAL BT COASTAL DEFENCE SITE BOMB CRATER RT EXTENDED DEFENCE OFFICERS POST BOMBING RANGE MARKER MINEWATCHERS POST DEFENCE SITE DOMESTIC SITE SN A building with small observation ports used for EMBARKATION POINT plotting mines dropped by parachute. HEADQUARTERS CL MILITARY DEFENCE AND FORTIFICATION MILITARY BASE BT COASTAL OBSERVATION POST MILITARY BUILDING MOBILE SOUND LOCATOR MILITARY CAMP SN A mobile piece of equipment used by the Royal MILITARY HOSPITAL Observer Corps to track the movements of MILITARY SITE enemy aircraft. PLUTO SITE CL MILITARY DEFENCE AND FORTIFICATION PRISONER OF WAR CAMP BT RADAR STATION ROYAL NAVY SHORE ESTABLISHMENT ROYAL ORDNANCE FACTORY MORRISON SHELTER TRAINING SITE SN A portable indoor air raid shelter in the form of a TRANSPORT SITE steel topped table, often with wire meshing MILITARY HEADQUARTERS around the sides. CL MILITARY DEFENCE AND FORTIFICATION SN A building used as the command centre of a BT AIR RAID SHELTER military operation. CL MILITARY DEFENCE AND FORTIFICATION MOTOR TRANSPORT BUILDING BT ANCILLARY BUILDING SN A building, on an airfield or military base, used for NT AIR FORCE HEADQUARTERS the maintenance and storage of motor vehicles. ARMY HEADQUARTERS CL MILITARY DEFENCE AND FORTIFICATION NAVAL HEADQUARTERS BT TECHNICAL AND INSTRUCTIONAL SITE TERRITORIAL ARMY HEADQUARTERS NT GARAGE MILITARY HOSPITAL VEHICLE SHED SN A hospital for the medical and surgical treatment NAAFI BUILDING of military personnel and/or their families. SN A building, administered by the Navy, Army and CL MILITARY DEFENCE AND FORTIFICATION Air Force Institutes, providing retail and leisure MILITARY OFFICE services to members of the armed forces. CL MILITARY DEFENCE AND FORTIFICATION SN An administrative building used to organize and co-ordinate the activities of members of the BT ANCILLARY BUILDING armed forces. NAVAL GUNNERY RANGE CL MILITARY DEFENCE AND FORTIFICATION SN An area of ground, usually situated on the coast, BT ANCILLARY BUILDING on which naval guns can be mounted for testing NT SQUADRON OFFICE purposes and to practice firing at targets usually MILITARY SITE placed out at sea to mimic surface vessels. SN Sites, buildings and structures used by the CL MILITARY DEFENCE AND FORTIFICATION military. BT FIRING RANGE

22 NAVAL HEADQUARTERS SN A building providing dining facilities and recreation SN A building used for the daily administration of the for commissioned officers. Royal Navy. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT MESS BT MILITARY HEADQUARTERS OFFICERS QUARTERS NIGHT FIGHTER STATION WATCH OFFICE SN A building where military officers are SN A two storey building with a watch office on the accommodated. ground floor and a control room above. Originally CL MILITARY DEFENCE AND FORTIFICATION based on drawing number 12096/4. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION OPERATIONS BLOCK BT CONTROL TOWER NT WATCH OFFICE (15684/41) SN A building of varying designs intended for directing military aviation operations. Normally NISSEN HUT associated with military airfields. SN A prefabricated structure of a steel frame clad in CL MILITARY DEFENCE AND FORTIFICATION corrugated iron. Semi-circular in section they BT TECHNICAL AND INSTRUCTIONAL SITE were used as accommodation for the armed OPERATIONS ROOM forces and, during WWII, as emergency housing for bombed out civilians. Also used for storage. SN A room used for directing military operations and CL MILITARY DEFENCE AND FORTIFICATION exercises. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION BT TECHNICAL AND INSTRUCTIONAL SITE NODAL POINT ORDNANCE DEPOT SN A designated area, usually sited at a strategic crossroads, with fixed defences such as SN A building or site used by the armed forces for pillboxes, anti tank ditches and gun the storage and issuing of military stores and emplacements, designed to act as a rallying point materials. for defenders. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT DEPOT BT DEFENDED LOCALITY ORLIT POST Norcon Pillbox SN A small prefabricated, reinforced concrete USE PILLBOX (TYPE CP/6/40/111) structure manufactured by Messrs Orlit Ltd for SN A proprietary name for a small, circular pillbox of the Royal Observer Corps. The first were Type CP/6/40/111. ordered in 1951, most were redundant by 1955, a few remained in use in eastern England until NUCLEAR BUNKER 1965. SN A reinforced concrete structure, often sited CL MILITARY DEFENCE AND FORTIFICATION underground, used as a shelter from the threat of BT ROYAL OBSERVER CORPS SITE nuclear attack. PARACHUTE AND CABLE LAUNCHER CL MILITARY DEFENCE AND FORTIFICATION BT CIVIL DEFENCE SITE UF Parachute And Cable Projecter RT AIR RAID SHELTER SN A site where a cable was fired into the air, with REGIONAL GOVERNMENT HEADQUARTERS parachutes attached to either end, to present an REGIONAL SEAT OF GOVERNMENT aerial obstruction to bring down, through contact, fouling and general drag, or obstruct the passage NUCLEAR COMMAND CENTRE of an aircraft. Usually found as one of a group. SN An underground structure from which operations CL MILITARY DEFENCE AND FORTIFICATION covering the whole, or part, of the country could BT ACTIVE AIR DEFENCE SITE be directed in the event of a nuclear attack. Parachute And Cable Projecter Usually equipped with air filtration equipment and supplies for several months. USE PARACHUTE AND CABLE LAUNCHER CL MILITARY DEFENCE AND FORTIFICATION PARACHUTE STORE (10825/42) BT HEADQUARTERS SN A distinctive, clerestory-roofed building of three OBSERVATION POST 10ft and two 12ft bays, used for the drying, SN A building or site for watching specific military storage and packing of military parachutes and activities or the movement of enemy forces, etc. built to Air Ministry drawing number 10825/42. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING BT STORAGE FACILITY NT AUXILIARY UNIT OBSERVATION POST PARACHUTE STORE (11137/41) BATTERY OBSERVATION POST BOMBING RANGE OBSERVATION POST SN A distinctive, clerestory-roofed building of five COASTAL OBSERVATION POST 10ft bays, used for the drying, storage and HOME GUARD OBSERVATION POST packing of military parachutes and built to Air Ministry drawing number 11137/41. OFFICERS MESS CL MILITARY DEFENCE AND FORTIFICATION BT STORAGE FACILITY

23 BT SPIGOT MORTAR EMPLACEMENT PARACHUTE STORE (175/36) PENTAD HANGAR SN A protected parachute store similar in design to SN An all-steel end-opening, hangar with canted the 6351/37 except constructed wholly from sides designed for folded-wing aircraft. reinforced concrete.. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AIRCRAFT HANGAR (TRANSPORTABLE) BT STORAGE FACILITY PETROLEUM WARFARE SITE PARACHUTE STORE (17865/39) SN A site, usually including fuel tanks, pipeworks SN A distinctive, clerestory-roofed building of five and control buildings, where flaming petroleum 10ft bays, used for the drying, storage and was intended to be used as a weapon against a packing of military parachutes and built to Air hostile invasion. Ministry drawing number 17865/39. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ANTI INVASION DEFENCE SITE BT STORAGE FACILITY NT BARREL FLAME TRAP PARACHUTE STORE (2355/25) FOUGASSE SN A brick-built building with four windows on the RT DEFENDED LOCALITY north-facing wall with a pitched roof and with a STOP LINE dormer roof light on both sides, intended for PHOTO INTERPRETATION CENTRE drying, storing and packing parachutes.The SN A building in which photographers, taken for 2355/25 was the first design for a purpose-built aerial reconnaissance purposes, are analysed parachute store. and interpreted to provide intelligence on enemy CL MILITARY DEFENCE AND FORTIFICATION activities. BT STORAGE FACILITY CL MILITARY DEFENCE AND FORTIFICATION PARACHUTE STORE (3633/35) BT AIRFIELD BUILDING SN A hut 51ft long by 20ft wide used to dry, store PICKETT HAMILTON FORT and pack parachutes.Similar in design to the UF Counter Balance Fort 2355/25, but constructed in timber instead of SN A sunken, circular, concrete pillbox used on brick. airfields. They remained flush with the surface to CL MILITARY DEFENCE AND FORTIFICATION permit the free movement of aircraft, but if attack BT STORAGE FACILITY threatened, could be raised, hydraulically or by a PARACHUTE STORE (6351/37) counterbalance, and manned to give covering SN A protected parachute store built with permanent fire. brick cavity walls and a roof of reinforced CL MILITARY DEFENCE AND FORTIFICATION concrete slabs in two heights separated by BT AIRFIELD DEFENCE SITE lantern lights. PILLBOX CL MILITARY DEFENCE AND FORTIFICATION PILLBOX BT STORAGE FACILITY SN An often squat building with thick, loopholed PARADE GROUND walls and a flat roof, designed to accommodate a SN A place where military personnel parade, variety of weapons, usually strategically practice marching, assemble or muster for a positioned to cover a vulnerable point in a march or any other special purpose. defensive system. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT DOMESTIC SITE BT ANTI INVASION DEFENCE SITE NT ALLAN WILLIAMS TURRET PASSIVE AIR DEFENCE SITE BISON MOBILE PILLBOX SN Sites, buildings or structures involved in passive PICKETT HAMILTON FORT air defence, usually by forcing hostile aircraft to PILLBOX (AIR MINISTRY PATTERN) fly high or drop their bombs on the wrong targets. PILLBOX (CANTILEVERED) Use more specific term. PILLBOX (MODIFIED) CL MILITARY DEFENCE AND FORTIFICATION PILLBOX (PREFABRICATED) BT AIR DEFENCE SITE PILLBOX (SHELLPROOF) NT ANTENNA ARRAY PILLBOX (TYPE 391) RADAR STATION PILLBOX (TYPE CE124/41) RADIO TELEGRAPHY STATION PILLBOX (TYPE CE2717) ROYAL OBSERVER CORPS SITE PILLBOX (TYPE CE2843) SOUND MIRROR PILLBOX (TYPE CE390) PILLBOX (TYPE CP/6/40/111) PEDESTAL PILLBOX (TYPE CRE TL62) SN A concrete, cylindrical pedestal on which a PILLBOX (TYPE CRE1094) spigot mortar was mounted. The pedestal is often PILLBOX (TYPE CRE1116) the only evidence for a Spigot Mortar PILLBOX (TYPE FW3/22) emplacement to survive. PILLBOX (TYPE FW3/23) CL MILITARY DEFENCE AND FORTIFICATION PILLBOX (TYPE FW3/24)

24 PILLBOX (TYPE FW3/25) BT PILLBOX PILLBOX (TYPE FW3/26) PILLBOX (TYPE CE2717) PILLBOX (TYPE FW3/27) SN A pillbox built to a design drawn up by the chief PILLBOX (TYPE FW3/28) engineer of Scottish Command. PILLBOX (TYPE FW3/28A) CL MILITARY DEFENCE AND FORTIFICATION PILLBOX (TYPE FW3/45) BT PILLBOX PILLBOX (TYPE FW3/46) PILLBOX (TYPE PD541) PILLBOX (TYPE CE2843) PILLBOX (VARIANT) SN A pillbox built to a design drawn up by the chief RUCK MACHINE GUN POST engineer of Scottish Command. TETT TURRET CL MILITARY DEFENCE AND FORTIFICATION RT DEFENDED LOCALITY BT PILLBOX STOP LINE PILLBOX (TYPE CE390) PILLBOX (AIR MINISTRY PATTERN) SN A pillbox built to a design drawn up by the chief SN A pillbox built to a design drawn up by the Air engineer of GHQ home forces. Ministry. Usually found near airfields. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT PILLBOX BT AIRFIELD DEFENCE SITE PILLBOX PILLBOX (TYPE CP/6/40/111) UF Norcon Pillbox PILLBOX (ASSAULT TRAINING) SN A circular pillbox, usually consisting of a concrete UF Dummy Pillbox pipe with a timber and corrugated iron roof, SN A pillbox constructed for use in training exercises surrounded and covered by earth and sandbags. forming part of a simulated defensive position. Built to a design by Norcon Ltd, a company CL MILITARY DEFENCE AND FORTIFICATION dealing in concrete pipes. BT TRAINING SITE CL MILITARY DEFENCE AND FORTIFICATION PILLBOX (CANTILEVERED) BT PILLBOX SN A pillbox in which the roof is detached from the PILLBOX (TYPE CRE TL62) walls and supported by a central pillar, thus SN A pillbox built to a design drawn up by the leaving an allowing a 360 degree field commander of the Royal Engineers in Southern of fire. Area (Taunton Line). CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT PILLBOX BT PILLBOX PILLBOX (MODIFIED) PILLBOX (TYPE CRE1094) SN A pillbox which has been modified from a SN A pillbox built to a design by the commander of standard Directorate of Fortifications and Works the Royal Engineers for the Colchester Garrison. design. Double index with specific type where CL MILITARY DEFENCE AND FORTIFICATION known. BT PILLBOX CL MILITARY DEFENCE AND FORTIFICATION BT PILLBOX PILLBOX (TYPE CRE1116) SN A pillbox built to a design by the commander of PILLBOX (PREFABRICATED) the Royal Engineers for the Colchester Garrison. SN A pillbox constructed of prefabricated concrete CL MILITARY DEFENCE AND FORTIFICATION panels. Double index with specific type where BT PILLBOX known. CL MILITARY DEFENCE AND FORTIFICATION PILLBOX (TYPE FW3/22) BT PILLBOX SN A hexagonal pillbox, with an internal anti-ricochet wall and loopholes for five Light Machine Guns PILLBOX (SHELLPROOF) and one rifle. Originally designed to have walls SN A pillbox with walls that have been thickened to 15in bulletproof walls many were built with 42in protect against shells. Double index with specific thick shellproof walls. Designed by DFW branch type where known. 3. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT PILLBOX BT PILLBOX PILLBOX (TYPE 391) PILLBOX (TYPE FW3/23) SN A pillbox built to a design drawn up by the chief SN A rectangular pillbox with an enclosed square engineer of GHQ home forces. plan section for three Light Machine Guns and an CL MILITARY DEFENCE AND FORTIFICATION adjacent open area housing a mounting for a BT PILLBOX Light Anti Aircraft weapon. Designed by DFW PILLBOX (TYPE CE124/41) branch 3. CL MILITARY DEFENCE AND FORTIFICATION SN A pillbox built to a design drawn up by the chief BT LIGHT ANTI AIRCRAFT BATTERY engineer of South-Eastern command. PILLBOX CL MILITARY DEFENCE AND FORTIFICATION PILLBOX (TYPE FW3/24)

25 SN A hexagonal pillbox with an internal anti-ricochet PILLBOX (TYPE PD541) wall and the rear wall lengthened to take two rifle UF Croft Pillbox loopholes in addition to five Light Machine Gun SN A circular pillbox designed by the Croft Granite, loopholes. Both 15in and 42in thick walls are Brick and Concrete Company, with six loopholes. common. Designed by DFW branch 3. With no roof or door access was gained through CL MILITARY DEFENCE AND FORTIFICATION the roof. BT PILLBOX CL MILITARY DEFENCE AND FORTIFICATION BT PILLBOX PILLBOX (TYPE FW3/25) UF Armco Pillbox PILLBOX (VARIANT) SN A circular pillbox designed by the Engineering and SN A pillbox which varies from the standard designs. Metals Company using 'Armco' corrugated iron CL MILITARY DEFENCE AND FORTIFICATION sheets as the inner and outer skins into which BT PILLBOX concrete was poured, giving a 12in wall PIMPLE thickness. The design was taken up by DFW and assigned a drawing number. UF Dragons Teeth CL MILITARY DEFENCE AND FORTIFICATION Sharks Teeth BT PILLBOX SN Blocks of solid concrete,in the form of truncated pyramids usually 3 feet square x 2 feet high PILLBOX (TYPE FW3/26) which could be placed in rows to impede enemy SN A square pillbox with loopholes for four Light movement in the event of invasion. Pimples were Machine Guns and walls 18in thick. Probably recommended for use on soft ground. designed by DFW branch 3 although it may have CL MILITARY DEFENCE AND FORTIFICATION been adapted from an external source as BT ANTI TANK BLOCK Southern Command correspondece refer to the ANTI BOAT LANDING OBSTACLE type as 'Stento'. PLUTO SITE CL MILITARY DEFENCE AND FORTIFICATION BT PILLBOX SN A site associated with Operation PLUTO (Pipe Line Under The Ocean) the operation to supply PILLBOX (TYPE FW3/27) the allies with fuel following the invasion of SN A large octagonal pillbox, with a projecting Normandy. entrance, equipped with loopholes for eight Light CL MILITARY DEFENCE AND FORTIFICATION Machine Guns and a Light Anti Aircraft mounting POLE sited in a central well which was accessed from inside the pillbox. Designed by DFW branch 3. SN A telegraph pole, tree trunk or similar erected on CL MILITARY DEFENCE AND FORTIFICATION the side of a road, or in an open space, to BT LIGHT ANTI AIRCRAFT BATTERY prevent the landing of hostile aircraft. PILLBOX CL MILITARY DEFENCE AND FORTIFICATION BT ANTI LANDING OBSTACLE PILLBOX (TYPE FW3/28) Portable Stand By Set House SN A square pillbox with walls up to 48in thick, designed to emplace a 2 pounder anti tank gun. A USE STAND BY SET HOUSE (3527/43) large opening in the back allowed the gun to be POWER GENERATION SITE wheeled into position at the large embrasure in the front wall. Designed by DFW branch 3. SN A site or building including generators and fuel CL MILITARY DEFENCE AND FORTIFICATION storage facilities used to generate electricity. BT ANTI TANK GUN EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION PILLBOX BT AIRFIELD SITE NT POWER HOUSE PILLBOX (TYPE FW3/28A) STAND BY SET HOUSE SN A large, rectangular pillbox based on the FW3/28 POWER HOUSE with the addition of a small infantry chamber to one side of the main gun chamber. SN A building housing the permanent electricity CL MILITARY DEFENCE AND FORTIFICATION generator supply for an airfield. Unlike stand by set houses, power houses had to cope with both BT PILLBOX essential and non-essential loads. ANTI TANK GUN EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION PILLBOX (TYPE FW3/45) BT POWER GENERATION SITE SN A pillbox design, assigned a drawing number by NT POWER HOUSE (1380/24) DFW branch 3. POWER HOUSE (207/17) CL MILITARY DEFENCE AND FORTIFICATION POWER HOUSE (476/18) BT PILLBOX POWER HOUSE (1380/24) PILLBOX (TYPE FW3/46) SN A power house built to Air Ministry drawing SN A pillbox design, assigned a drawing number by number 1380/24. DFW branch 3. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT POWER HOUSE BT PILLBOX POWER HOUSE (207/17)

26 SN A power house built to Air Ministry drawing CL MILITARY DEFENCE AND FORTIFICATION number 207/17 and comprising four rooms; a BT BOMBING DECOY SITE driver's room, workshop and store, battery room QL SITE and engine room containing 2 generator sets. CL MILITARY DEFENCE AND FORTIFICATION SN A decoy site designed to simulate permitted BT POWER HOUSE lighting, such as locomotives, furnaces and tramwire flashes, to lure attacking night bombers POWER HOUSE (476/18) away from legitimate targets. SN The standard RFC power house built to Air CL MILITARY DEFENCE AND FORTIFICATION Ministry drawing number 476/18 and comprising BT BOMBING DECOY SITE an engine room with a small workshop and QUADRANT TOWER driver's room. CL MILITARY DEFENCE AND FORTIFICATION SN An observation tower on a bombing range from BT POWER HOUSE which an observer could watch the bombing runs and report back to the aircraft on their PRISONER OF WAR CAMP accuracy. SN A prison site for the containment of servicemen CL MILITARY DEFENCE AND FORTIFICATION captured in war. BT AIRFIELD BUILDING CL MILITARY DEFENCE AND FORTIFICATION QUARTERMASTERS STORE PYROTECHNIC STORE (2647/37) SN A building or group of buildings used for the SN A protected building used for the storage of storage and issuing of rations and equipment to explosives and other pyrotechnic equipment and an army unit. designed to Air Ministry drawing number 2647/37. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING BT EXPLOSIVES STORAGE FACILITY QUONSET HUT Q SITE SN A lightweight prefabricated structure of UF Avenue Type Flarepath Site corrugated galvanized steel having a semicircular Drem Type Flarepath Site cross section. The design was based on the Dummy Landing Ground (Night) Nissen Hut developed by the British during the In Line Type Flarepath Site First World War. T Type Flarepath Site CL MILITARY DEFENCE AND FORTIFICATION SN A decoy site designed to simulate the flarepath BT ANCILLARY BUILDING lighting of permanent RAF stations, to lure RADAR MAST attacking night bombers away from legitimate targets. SN A tall, usually steel, structure used to receive and CL MILITARY DEFENCE AND FORTIFICATION transmit radio signals in order to determine the BT BOMBING DECOY SITE height, distance and number of aircraft NT Q SITE SHELTER (3395/40) approaching. Q SITE SHELTER (367/41) CL MILITARY DEFENCE AND FORTIFICATION BT RADAR STATION Q SITE SHELTER (3395/40) RADAR STATION SN An operations room, built to drawing number 3395/40, to control the lighting arrays of the 'T' SN A building or site incorporating equipment used type of bombing decoy in use during the Second for detecting the presence of enemy aircraft or World War. It was semi-sunken for added ships. protection and then covered in earth. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT PASSIVE AIR DEFENCE SITE BT Q SITE EARLY WARNING STATION DECOY SITE SHELTER NT CHAIN HOME STATION MOBILE SOUND LOCATOR Q SITE SHELTER (367/41) RADAR MAST SN An operations room, built to drawing number RADAR STATION SET HOUSE 367/41, to control the lighting arrays of the DREM RADAR STATION SET HOUSE type of bombing decoy in use during the Second World War. Unlike earlier designs it was surface SN A building housing the generator set and built and then covered in earth to protect against associated equipment supplying electricity to a flooding. radar station. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT Q SITE BT RADAR STATION DECOY SITE SHELTER RADIO MAST QF SITE SN A tall, usually steel, structure used to receive and SN A decoy fire positioned close to a legitimate target transmit radio signals. which would be lit in the event of an incendiary CL MILITARY DEFENCE AND FORTIFICATION attack in the hope that subsequent bombs would BT RADIO STATION be drawn to the area of the decoy. RADIO STATION

27 SN A building or group of buildings containing conduct the business of government in the event equipment capable of transmitting and receiving of nuclear war. Date specific from mid 1980's to radio signals. Use BROADCASTING RADIO early 1990's. STATION for broadcasting establishments e.g. CL MILITARY DEFENCE AND FORTIFICATION BFBS Radio stations. BT CIVIL DEFENCE BUILDING CL MILITARY DEFENCE AND FORTIFICATION RT NUCLEAR BUNKER BT COMMUNICATIONS BUILDING REGIONAL GOVERNMENT SHELTER NT RADIO MAST CL MILITARY DEFENCE AND FORTIFICATION RADIO TELEGRAPHY MAST BT AIR RAID SHELTER SN A tall, usually steel, structure used to receive and REGIONAL SEAT OF GOVERNMENT transmit radio telegraphy signals. CL MILITARY DEFENCE AND FORTIFICATION SN A reinforced concrete structure, usually sited BT RADIO TELEGRAPHY STATION underground, from where it was intended to conduct the business of government in the event RADIO TELEGRAPHY STATION of nuclear war. Date specific late 1950's to early UF Wireless Telegraphy Station 1970's. Y Station CL MILITARY DEFENCE AND FORTIFICATION Z Station BT CIVIL DEFENCE BUILDING SN A building or group of buildings, incorporating NT SUB REGIONAL SEAT OF GOVERNMENT radio masts, built to intercept radio transmissions RT NUCLEAR BUNKER from enemy vessels and aircraft during WWI. REMOUNT DEPOT CL MILITARY DEFENCE AND FORTIFICATION BT PASSIVE AIR DEFENCE SITE SN A building or site used as a distribution centre for EARLY WARNING STATION Army horses/ remounts and mules. NT RADIO TELEGRAPHY MAST CL MILITARY DEFENCE AND FORTIFICATION BT DEPOT RAIDSAFE SHELTER REQUISITIONED BUILDING SN A small, industrially manufactured, air raid shelter, designed to be used inside buildings and to SN A building which has been temporarily taken over provide cover for nightwatchmen or firewatchers for use by the military or civilian authorities. remaining on site during air raids. During wartime buildings were requisitioned for CL MILITARY DEFENCE AND FORTIFICATION various purposes, such as temporary hospitals BT AIR RAID SHELTER or headquarters. CL MILITARY DEFENCE AND FORTIFICATION RAILBLOCK BT ANCILLARY BUILDING SN Obstacles, often semi permanent, which are Resistance Hideout placed on railway lines to prevent the enemy from using them. Set up during the defence of USE AUXILIARY UNIT OPERATIONAL BASE Britain. RIFLE PIT CL MILITARY DEFENCE AND FORTIFICATION BT ANTI INVASION DEFENCE SITE SN A pit dug to protect a small group of infantry men. ANTI TANK ISLAND CL MILITARY DEFENCE AND FORTIFICATION RT ANTI TANK OBSTACLE BT FIELDWORK DEFENDED LOCALITY Rifle Post STOP LINE USE INFANTRY POST RECEPTION CENTRE RIFLE RANGE CL MILITARY DEFENCE AND FORTIFICATION SN A target range used for rifle and small arms BT ANCILLARY BUILDING practice. RECREATION HUT CL MILITARY DEFENCE AND FORTIFICATION SN A hut, usually built as part of a complex on a BT WEAPON TESTING FACILITY military base or airfield and used for the ROAD recreation of military personnel. SN A way between different places, used by CL MILITARY DEFENCE AND FORTIFICATION horses, travellers on foot and vehicles. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION REGIMENTAL HEADQUARTERS BT TRANSPORT SITE SN The main administrative building and headquarters ROADBLOCK of a regiment. SN A combination of obstructions, used either to stop CL MILITARY DEFENCE AND FORTIFICATION enemy forces or force them off the road. BT ANCILLARY BUILDING CL MILITARY DEFENCE AND FORTIFICATION NT DRILL HALL BT ANTI INVASION DEFENCE SITE REGIONAL GOVERNMENT HEADQUARTERS ANTI TANK ISLAND SN A reinforced concrete structure, usually sited RT ANTI TANK HAIRPIN underground, from where it was intended to ANTI TANK OBSTACLE DEFENDED LOCALITY

28 STOP LINE of the Royal Navy. CL MILITARY DEFENCE AND FORTIFICATION ROBINS (TYPE B) BT DEPOT SN A small dispersal WWII military aircraft hangar ROYAL NAVY SHORE ESTABLISHMENT featuring an "A" shaped steel frame clad wit SN A complex of buildings used as a headquarters corrugated iron; end doors were supported by and training base for Royal Navy personnel. Even outriggers when open.Typically use on aircraft though they are buildings on land shore storage units or satellite landing grounds. establishments are deemed to be shipsand are Variations in size. designated 'HMS' eg. HMS Dolphin in Portsmouth. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT AIRCRAFT HANGAR ROYAL OBSERVER CORPS COMMAND CENTRE ROMNEY HUT SN A command centre used to co-ordinate SN A prefabricated structure of a steel frame clad in information received from Royal Observer Corps corrugated iron. Semi-circular in section they observation and monitoring posts. were used for storage and as workshops, CL MILITARY DEFENCE AND FORTIFICATION cinemas etc during WWII. Designed at Romney BT ROYAL OBSERVER CORPS SITE House, London by the Directorate of Fortifications & Works. ROYAL OBSERVER CORPS HEADQUARTERS CL MILITARY DEFENCE AND FORTIFICATION SN A building used by the Royal Observer Corps as BT ANCILLARY BUILDING a headquarters and reporting centre. It may also ROYAL AIR FORCE BASE fulfil an observation and nuclear fallout monitoring role. Use term to describe headquarters for SN A site, usually with an airfield, hangars and plotting and monitoring nuclear fallout. control buildings, used for the storage and CL MILITARY DEFENCE AND FORTIFICATION deployment of military aircraft or the BT ROYAL OBSERVER CORPS SITE administration of the Royal Air Force. May also include accommodation buildings for personnel. ROYAL OBSERVER CORPS MONITORING POST CL MILITARY DEFENCE AND FORTIFICATION SN A small underground chamber from where it was BT MILITARY BASE intended to monitor radioactive fallout in the event ROYAL AIR FORCE CAMP of nuclear attack. The majority were built between 1956 and 1964, although construction SN A site with accommodation buildings and ancillary continued into the early 1970s. facilities for Royal Air Force personnel. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ROYAL OBSERVER CORPS SITE BT MILITARY CAMP ROYAL OBSERVER CORPS SITE ROYAL NAVAL AIR STATION SN A site or structure associated with the activities SN An airfield with associated hangars and control of the Royal Observer Corps. The Corps was buildings used for the storage, maintenance and formed on 1 January 1947 and disbanded in deployment of military aircraft and airships flown 1991. by the Royal Naval Air Service. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT PASSIVE AIR DEFENCE SITE BT MILITARY SITE EARLY WARNING SITE ROYAL NAVAL AIR STATION CONTROL TOWER CIVIL DEFENCE SITE SN A control tower constructed on RNAS stations by NT GROUP HEADQUARTERS the Royal Marine Engineers. Built to a common ORLIT POST ground floor plan they could be built with one, ROYAL OBSERVER CORPS COMMAND CENTRE two or three storeys above this depending on the ROYAL OBSERVER CORPS HEADQUARTERS requirements of the station. ROYAL OBSERVER CORPS MONITORING POST CL MILITARY DEFENCE AND FORTIFICATION UNDERGROUND MONITORING POST BT CONTROL TOWER ROYAL ORDNANCE FACTORY NT CONTROL TOWER (3860/42) SN A factory used for the manufacture of ordnance CONTROL TOWER (566/42) including small arms, ammunition, artillery pieces ROYAL NAVAL BASE and armoured fighting vehicles. SN A site, usually with docks and control buildings, CL MILITARY DEFENCE AND FORTIFICATION used for the storage, maintenance and RUCK MACHINE GUN POST deployment of military vessels or the SN A machine gun post designed by James Ruck administration of the Royal Navy. May also constructed from hollow concrete blocks and include accommodation buildings for personnel. prefabricated concrete sheeting with loopholes CL MILITARY DEFENCE AND FORTIFICATION allowing for a garrison of eight. BT MILITARY BASE CL MILITARY DEFENCE AND FORTIFICATION ROYAL NAVAL DEPOT BT PILLBOX SN A building or site used for the storage and SEAGULL TRENCH distribution of the essential logistical requirements SN A trench in the form of a flattened 'W' with a flat

29 concrete roof covered in turf, supported on SN A large pillbox-like structure, often L-shaped or concrete pillars. The name derives from the angular, with numerous loopholes used as a resemblance to a child's drawing of a seagull in defensive position. flight. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT DEFENDED BUILDING BT AIRFIELD DEFENCE SITE SERGEANTS MESS Seaplane Hangar SN A building providing dining facilities and recreation USE SEAPLANE SHED for non-commissioned officers. CL MILITARY DEFENCE AND FORTIFICATION SEAPLANE SHED BT MESS UF Seaplane Hangar SN An aircraft hangar designed to house seaplanes. Sf Site CL MILITARY DEFENCE AND FORTIFICATION USE STARFISH SITE BT AIRCRAFT STORAGE FACILITY Sharks Teeth NT SEAPLANE SHED (TYPE F) SEAPLANE SHED (TYPE G) USE PIMPLE SEAPLANE SHED (TYPE J) SICK QUARTERS SEAPLANE SHED (TYPE F) SN A building used for the accommodation of sick SN A military side-opening aircraft hangar originally and wounded members of the armed forces. designed for seaplanes and used RNAS bases CL MILITARY DEFENCE AND FORTIFICATION from 1916. Steel framed with asbestos or BT DOMESTIC SITE corrugated iron cladding. SIGNAL SQUARE CL MILITARY DEFENCE AND FORTIFICATION BT SEAPLANE SHED SN A signalling structure used on WWII airfields, comprising a concrete square base with a kerbed SEAPLANE SHED (TYPE G) border into which concrete signal symbols could SN A side-opening steel framed shed. A smaller be placed to advise pilots in the air of current version of the SEAPLANE SHED (TYPE F) they airfield state e.g. directions of landing and airfield were built from 1916 on RNAS seaplane bases. circuit. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT SEAPLANE SHED BT DOMESTIC SITE SEAPLANE SHED (TYPE J) SIGNALS GATHERING STATION SN A steel framed seaplane hangar designed for SN Buildings and structures associated with the Royal Navy Air Stations by the admiralty in 1917- acquisition of electronic signals for the purpose 1918. of intelligence gathering. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT SEAPLANE SHED BT COMMUNICATIONS BUILDING SEAPLANE STATION SLIT TRENCH SN A building complex with hangars and slipways SN A short trench used to protect troops or to built adjacent to a body of water where provide defensive fire from, often dug for seaplanes can be stored and maintained. practice purposes. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT MILITARY SITE BT TRENCH SEARCHLIGHT BATTERY SONAR STATION SN A site in which one or more searchlights were SN A building or site incorporating sonar equipment positioned to locate enemy aircraft or surface used for detecting the presence of enemy ships vessels for the benefit of batteries and night or submarines. fighter aircraft. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT EARLY WARNING SITE BT ANTI AIRCRAFT DEFENCE SITE Sound Dish NT BATTERY OBSERVATION POST USE SOUND MIRROR SEARCHLIGHT EMPLACEMENT RT BATTERY ENGINE HOUSE SOUND MIRROR LYON LIGHT EMPLACEMENT UF Sound Dish SEARCHLIGHT EMPLACEMENT SN An early warning structure built during and after SN A site in which one or more searchlights and their WWI along the south and east coasts of England. Sound detecting acoustic dishes and walls could accompanying structures were positioned to locate enemy aircraft or surface vessels for the detect the sound of approaching enemy aircraft benefit of batteries and night fighter aircraft. at a distance of 8 to 15 miles. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION PASSIVE AIR DEFENCE SITE BT SEARCHLIGHT BATTERY BT EARLY WARNING SITE SECTION POST NT SOUND MIRROR (20 FEET)

30 SOUND MIRROR (200 FEET) SN A building housing the stand-by generator set SOUND MIRROR (30 FEET) and associated equipment which could supply electricity to all essential services in the event of SOUND MIRROR (20 FEET) a power cut. SN A concrete, circular concave dish 20 feet in CL MILITARY DEFENCE AND FORTIFICATION diameter used as an acoustic listening device to BT POWER GENERATION SITE detect approaching enemy aircraft. NT STAND BY SET HOUSE (1039/41) CL MILITARY DEFENCE AND FORTIFICATION STAND BY SET HOUSE (13244/41) BT SOUND MIRROR STAND BY SET HOUSE (16302/41) SOUND MIRROR (200 FEET) STAND BY SET HOUSE (3527/43) STAND BY SET HOUSE (4238/44) SN A concrete, concave wall 200 feet in length used STAND BY SET HOUSE (607/36) as an acoustic listening device to detect STAND BY SET HOUSE (8760/42) approaching enemy aircraft. STAND BY SET HOUSE (974/35) CL MILITARY DEFENCE AND FORTIFICATION BT SOUND MIRROR STAND BY SET HOUSE (1039/41) SOUND MIRROR (30 FEET) SN A stand by set house built to Air Ministry drawing number 1039/41. SN A concrete, circular concave dish 30 feet in CL MILITARY DEFENCE AND FORTIFICATION diameter used as an acoustic listening device to BT STAND BY SET HOUSE detect approaching enemy aircraft. CL MILITARY DEFENCE AND FORTIFICATION STAND BY SET HOUSE (13244/41) BT SOUND MIRROR SN A stand by set house designed to drawing SOUND MIRROR BUILDING number 13244/41 and comprising of 4 rooms; a fuel storage room, a transformer chamber, a SN A building associated with the early 20th century switchgear chamber and the main engine room acoustic detection system. with 2 diesel engines. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT EARLY WARNING SITE BT STAND BY SET HOUSE SPECIAL OPERATIONS EXECUTIVE BASE STAND BY SET HOUSE (16302/41) SN A military base for the training of SOE operatives SN A stand by set house similar to 13244/41 and in the skills and techniques required to survive in designed to drawing number 16302/41 and enemy-occupied territory. comprising of 4 rooms; a fuel storage room, a CL MILITARY DEFENCE AND FORTIFICATION transformer chamber, a switchgear chamber and BT MILITARY BASE the main engine room with 3 diesel engines. SPIDER BILLET CL MILITARY DEFENCE AND FORTIFICATION BT STAND BY SET HOUSE SN A barracks comprising eight barrack blocks accessed via a central corridor. With four blocks STAND BY SET HOUSE (3527/43) on either side of the corridor the whole structure UF Portable Stand By Set House resembled a spider in plan. SN A portable stand by set house built to Air Ministry CL MILITARY DEFENCE AND FORTIFICATION drawing number 3527/43. BT BARRACK BLOCK CL MILITARY DEFENCE AND FORTIFICATION SPIGOT MORTAR EMPLACEMENT BT STAND BY SET HOUSE SN A pit or emplacement surrounding a concrete STAND BY SET HOUSE (4238/44) pedestal, or 'thimble', which was used to mount a SN A stand by set house built to Air Ministry drawing spigot mortar. Deployed by the Home Guard number 4238/44. during WWII as an anti invasion measure. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT STAND BY SET HOUSE BT ANTI INVASION DEFENCE SITE NT PEDESTAL STAND BY SET HOUSE (607/36) RT DEFENDED LOCALITY SN An expansion period stand by set house STOP LINE designed to drawing number 607/36 and SQUADRON OFFICE containing a single generator set and switch board. Constructed in reinforced concrete. SN A building used for the administration of a CL MILITARY DEFENCE AND FORTIFICATION squadron. BT STAND BY SET HOUSE CL MILITARY DEFENCE AND FORTIFICATION BT MILITARY OFFICE STAND BY SET HOUSE (8760/42) SQUASH RACQUETS COURT SN A stand by set house built with a steel-framed pitched roof. Built to drawing number 8760/42 it SN A building in which the game of squash can be was intended to supersede all earlier designs played. and was cheaper to produce. Both the CL MILITARY DEFENCE AND FORTIFICATION transformer and fuel tanks were located outside BT DOMESTIC SITE the main building. STAND BY SET HOUSE CL MILITARY DEFENCE AND FORTIFICATION

31 BT STAND BY SET HOUSE PARACHUTE STORE (6351/37) STAND BY SET HOUSE (974/35) STORAGE BUILDING SN An expansion period stand by set house VEHICLE PARK designed to drawing number 974/35 and WATER STORAGE FACILITY containing a single generator set and switch STRONGPOINT board. Constructed with brick cavity walls. SN A fortifed position, often including fieldworks or CL MILITARY DEFENCE AND FORTIFICATION defensive structures, designed to keep enemy BT STAND BY SET HOUSE forces engaged to allow reinforcements to be STARFISH SITE mobilized. UF Sf Site CL MILITARY DEFENCE AND FORTIFICATION SN A decoy site designed to simulate a burning BT DEFENDED LOCALITY urban area during a bombing raid in order to lure SUB REGIONAL SEAT OF GOVERNMENT enemy bombers away form legitimate targets. SN A structure, often sited underground, from where CL MILITARY DEFENCE AND FORTIFICATION it was intended to conduct the business of BT BOMBING DECOY SITE government in the event of nuclear war. Sub STOP LINE RSGs were introduced between the RSGs and local authorities to allow the RSGs to focus on SN A notional line of resistance defined by anti tank strategic direction. obstacles, pillboxes and gun emplacements. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT REGIONAL SEAT OF GOVERNMENT BT ANTI INVASION DEFENCE SITE RT ANTI TANK GUN EMPLACEMENT SUBMARINE MINE ESTABLISHMENT ANTI TANK OBSTACLE SN A complex of purpose-built or adapted buildings BARBED WIRE ENTANGLEMENT used for the maintenance, storage, assembly and DEFENDED BUILDING control of sea mines and minefields. DEFENDED LOCALITY CL MILITARY DEFENCE AND FORTIFICATION DEMOLITION CHARGE SITE BT COASTAL DEFENCE SITE FIELDWORK LYON LIGHT EMPLACEMENT SUPER ROBINS PETROLEUM WARFARE SITE SN An aircraft hangar designed to Air Ministry PILLBOX specification (drawing number 6910/43). Similar RAILBLOCK in design to the ROBINS AIRCRAFT HANGAR but ROADBLOCK larger. SPIGOT MORTAR EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION STORAGE BUILDING BT AIRCRAFT HANGAR SN A building used for the storage of equipment and SUPER ROBINS (TYPE A) ordnance. SN An aircraft hangar designed to Air Ministry CL MILITARY DEFENCE AND FORTIFICATION specifications (drawing number 2243/41). BT STORAGE FACILITY Constructed from prefabricated A-frames and STORAGE DEPOT clad in corrugated iron. CL MILITARY DEFENCE AND FORTIFICATION SN A building or site used for the storage of goods BT AIRCRAFT HANGAR or equipment. CL MILITARY DEFENCE AND FORTIFICATION SUPPLY DEPOT BT DEPOT SN A building or site used for the storage and STORAGE FACILITY distribution of the essential logistical requirements of an armed force. SN Sites and buildings used for the storage or CL MILITARY DEFENCE AND FORTIFICATION equipment, ordnance or vehicles. Use more BT DEPOT specific term. CL MILITARY DEFENCE AND FORTIFICATION T Type Flarepath Site BT AIRFIELD SITE USE Q SITE NT ART STORAGE FACILITY CHEMICAL WEAPONS STORE TANK PARK DEPOT SN A site where tanks and armoured fighting DINGHY SHED (2900/43) vehicles can be stored. DINGHY SHED (2901/43) CL MILITARY DEFENCE AND FORTIFICATION EMERGENCY STORE BT VEHICLE PARK EXPLOSIVES STORAGE FACILITY TARGET RAILWAY FUEL STORE PARACHUTE STORE (10825/42) SN A miniature railway on which targets can be PARACHUTE STORE (11137/41) placed to provide moving targets on a firing PARACHUTE STORE (175/36) range. PARACHUTE STORE (17865/39) CL MILITARY DEFENCE AND FORTIFICATION PARACHUTE STORE (2355/25) BT TARGET RANGE PARACHUTE STORE (3633/35)

32 TARGET RANGE SN A missile base armed with the Thor Intermediate SN An area of ground used for the testing of, and Range Ballistic Missile. Thor Missiles were practicing with, weapons against fixed and deployed in Britain under joint British/US control moveable targets. between 1959 and 1964. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT FIRING RANGE BT ACTIVE AIR DEFENCE SITE NT TARGET RAILWAY TORPEDO RANGE TECHNICAL AND INSTRUCTIONAL SITE SN A designated area of water in which the SN Sites used for the maintenance of military perfromance of torpedoes can be evaluated. equipment and buildings and the instruction of CL MILITARY DEFENCE AND FORTIFICATION military personnel. Use more specific term. BT FIRING RANGE CL MILITARY DEFENCE AND FORTIFICATION NT TORPEDO RANGE CONTROL BUILDING BT AIRFIELD SITE TORPEDO RANGE CONTROL BUILDING NT AEROPLANE REPAIR SECTION SHED AIRCRAFT MAINTENANCE UNIT SN A building from which the firing of torpedoes can BOMBING TEACHER BUILDING be controlled and evaluated. DRYING TOWER (11595/42) CL MILITARY DEFENCE AND FORTIFICATION DRYING TOWER (9290/42) BT TORPEDO RANGE DRYING TOWER (9294/42) TORPEDO STATION FIRE TENDER HOUSE INSTRUCTIONAL SITE SN A land based establishment armed with LINK TRAINER torpedoes and used to defend the coast from MOTOR TRANSPORT BUILDING enemy shipping. OPERATIONS BLOCK CL MILITARY DEFENCE AND FORTIFICATION OPERATIONS ROOM BT COASTAL DEFENCE SITE TECHNICAL SITE TRAINING AREA TURRET TRAINER SN A designated area of land, usually closed to the TECHNICAL SITE public, used for military exercises and training SN A site associated with the maintenance of military purposes. equipment and buildings. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT TRAINING SITE BT TECHNICAL AND INSTRUCTIONAL SITE NT FIRING RANGE NT CONTROL BUILDING GRENADE RANGE TRANSFORMER BUILDING TRAINING BASE VEHICLE REPAIR CENTRE SN A military base used for training service VEHICLE WASHDOWN STATION personnel. TENNIS COURT CL MILITARY DEFENCE AND FORTIFICATION SN A prepared area, traditionally grass, where BT TRAINING SITE tennis is played. MILITARY BASE CL MILITARY DEFENCE AND FORTIFICATION TRAINING CAMP BT DOMESTIC SITE SN A military camp providing training facilities. TERRITORIAL ARMY HEADQUARTERS CL MILITARY DEFENCE AND FORTIFICATION SN A building used as headquarters by the Territorial BT TRAINING SITE Army, the volunteer reserve of the British army. MILITARY CAMP CL MILITARY DEFENCE AND FORTIFICATION TRAINING CENTRE BT MILITARY HEADQUARTERS SN A place where specific skills are taught on short TETRAHEDRON courses SN Triangular concrete pyramids with 6 feet long CL MILITARY DEFENCE AND FORTIFICATION sides and 5 feet high, intended to impede enemy BT TRAINING SITE movement in the event of invasion. Thought to be NT CIVIL DEFENCE TRAINING CENTRE confined geogaphically to Southern Command. TRAINING SCHOOL WATCH OFFICE CL MILITARY DEFENCE AND FORTIFICATION SN Based on a typical 18ft span, 40ft long temporary BT ANTI TANK BLOCK brick hut but with two bay windows in the front TETT TURRET elevation, one for the watch office and one for SN A small concrete turret placed on top of a the chief instructor. standard 4ft diameter concrete pipe sunk into the CL MILITARY DEFENCE AND FORTIFICATION ground intended for use in defending road BT CONTROL TOWER junctions. TRAINING SITE CL MILITARY DEFENCE AND FORTIFICATION SN A site used for military training. Use more specific BT PILLBOX term. THOR MISSILE LAUNCH SITE CL MILITARY DEFENCE AND FORTIFICATION NT AIR RAID PRECAUTIONS TRAINING CENTRE

33 ANTI TANK WALL (ASSAULT TRAINING) BT TECHNICAL SITE PILLBOX (ASSAULT TRAINING) VEHICLE SHED TRAINING AREA SN A shed used for the storage of vehicles. TRAINING BASE CL MILITARY DEFENCE AND FORTIFICATION TRAINING CAMP BT MOTOR TRANSPORT BUILDING TRAINING CENTRE VEHICLE WASHDOWN STATION TRANSFORMER BUILDING SN A site or building in which vehicles can be SN A building housing transformers to convert AC cleaned to ensure a good working condition. electricity supply for domestic use. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT TECHNICAL SITE BT TECHNICAL SITE Very Heavy Bomber Station Control Tower (294/45) TRANSPORT SITE USE BOMBER STATION CONTROL TOWER (294/45) SN A site associated with transport including both vehicles and transport infrastructure. VICKERS MACHINE GUN EMPLACEMENT CL MILITARY DEFENCE AND FORTIFICATION SN A square, concrete pillbox-like structure with 36in NT AIRFIELD SITE thick walls and a single large embrasure used to BRIDGE emplace a Vickers Medium Machine Gun. The ROAD entrance was protected by an external blast TRENCH wall. CL MILITARY DEFENCE AND FORTIFICATION SN A linear fieldwork dug as a means of BT MACHINE GUN EMPLACEMENT concealment, protection or both. CL MILITARY DEFENCE AND FORTIFICATION VULNERABLE DEFILE BT FIELDWORK SN A pass, vulnerable to attack from the enemy but NT COMMUNICATION TRENCH essential for the movement of troops and which, FIRE TRENCH if captured, could divide a defending force. As a SLIT TRENCH result such passes are defended with anti TURRET TRAINER invasion defences such as pillboxes. CL MILITARY DEFENCE AND FORTIFICATION SN An airfield building housing a turret gunnery BT ANTI INVASION DEFENCE SITE trainer used to teach air gunners how to report the correct position of enemy aircraft by WAR PRODUCTION FACTORY practising shooting against projected moving SN A factory or works which has been temporarily images of enemy aircraft displayed on a target turned over to the manufacture ofgoods for the screen (WWII). war effort. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT TECHNICAL AND INSTRUCTIONAL SITE BT ANCILLARY BUILDING UNDERGROUND MONITORING POST WAR ROOM SN A small underground chamber from where it was SN A reinforced concrete structure, which may be intended to monitor radioactive fallout in the event sited above ground or semi-sunken, from where of nuclear attack. The majority were built it was intended to conduct the business of between 1956 and 1964, although construction government from, in the event of nuclear war. continued into the early 1970s. Date specific to the early-mid 1950's. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT ROYAL OBSERVER CORPS SITE BT CIVIL DEFENCE BUILDING VEHICLE DEPOT WATCH OFFICE SN A storage facility used for the accommodation SN A building, originally used as a shelter for the and dispersal of military vehicles. duty pilot or officer on watch on an airfield, and CL MILITARY DEFENCE AND FORTIFICATION later used to direct air traffic. Use more specific BT DEPOT type where known. VEHICLE PARK CL MILITARY DEFENCE AND FORTIFICATION BT CONTROL TOWER SN A site, usually consisting of a simple open area of NT WATCH OFFICE (1072/26) land or hardstanding and used for the storage of WATCH OFFICE (12779/41) vehicles. WATCH OFFICE (1597/27) CL MILITARY DEFENCE AND FORTIFICATION WATCH OFFICE (1959/34) STORAGE FACILITY BT WATCH OFFICE (1960/34) NT AMBULANCE PARK WATCH OFFICE (207/36) TANK PARK WATCH OFFICE (343/43) VEHICLE REPAIR CENTRE WATCH OFFICE (4698/43) WATCH OFFICE WITH MET SECTION SN A building or site used for the maintenance and repair of motor vehicles. WATCH OFFICE (1072/26) CL MILITARY DEFENCE AND FORTIFICATION SN A small, single storey building used as the Pilots'

34 room on fighter stations and as the watch office 1960/34. on bomber stations. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT WATCH OFFICE BT WATCH OFFICE WATCH OFFICE (207/36) WATCH OFFICE (12779/41) SN A two-storey watch office similar in design to SN A two-storey, structure with a brick ground floor drawing number 1959/34 but constructed and a reinforced concrete upper floor with completely from concrete. A large, almost square, balcony and large windows to the watch office ground plan with a central observation tower. and control room. This became the most common CL MILITARY DEFENCE AND FORTIFICATION building design for air traffic control in the Second BT WATCH OFFICE World War. WATCH OFFICE (3156/41) CL MILITARY DEFENCE AND FORTIFICATION BT WATCH OFFICE SN A fighter satellite station watch office built to Air Ministry design drawing number 3156/41 WATCH OFFICE (13726/41) CL MILITARY DEFENCE AND FORTIFICATION SN A detached building without an operations block BT FIGHTER SATELLITE STATION WATCH OFFICE and crew briefing room designed on modern lines WATCH OFFICE (343/43) similar to, but smaller than WATCH OFFICE (12779/41). Began appearing on new stations SN A modification of WATCH OFFICE (12779/41) from September 1941. where the original large windows were removed CL MILITARY DEFENCE AND FORTIFICATION and smaller frames fitted, the gap being filled with BT BOMBER SATELLITE STATION WATCH OFFICE straight-joint brickwork. CL MILITARY DEFENCE AND FORTIFICATION WATCH OFFICE (14383/40) BT WATCH OFFICE SN A fighter satellite station watch office built to Air WATCH OFFICE (4698/43) Ministry design drawing number 14383/40 CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT FIGHTER SATELLITE STATION WATCH OFFICE BT WATCH OFFICE WATCH OFFICE (15684/41) WATCH OFFICE WITH MET SECTION SN A night fighter station watch office based on the SN A watch office with additional rooms given over standard design for Bomber Satellite Station to the meteorological section, including a forecast watch offices. room and met store. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT NIGHT FIGHTER STATION WATCH OFFICE BT WATCH OFFICE NT WATCH OFFICE WITH MET SECTION (2328/39) WATCH OFFICE (1597/27) WATCH OFFICE WITH MET SECTION (2423/39) SN A small building housing pilot's and locker rooms WATCH OFFICE WITH MET SECTION (518/40) with flight offices and a watch office. The only WATCH OFFICE WITH MET SECTION (5845/39) known example was built at Tangmere. WATCH OFFICE WITH MET SECTION (8936/40) CL MILITARY DEFENCE AND FORTIFICATION WATCH OFFICE WITH MET SECTION (2328/39) BT WATCH OFFICE UF Watch Office With Meteorological Section WATCH OFFICE (17658/40) (2328/39) SN A fighter satellite station watch office built to Air SN A two-storey, all-concrete construction with a Ministry design drawing number 17658/40. watch office and additional rooms given over to CL MILITARY DEFENCE AND FORTIFICATION the meteorological section, including a forecast BT FIGHTER SATELLITE STATION WATCH OFFICE room and met store. A concrete parapet all around the roof differentiates it from 5845/39. WATCH OFFICE (18441/40) CL MILITARY DEFENCE AND FORTIFICATION SN A fighter satellite station watch office built to Air BT WATCH OFFICE WITH MET SECTION Ministry design drawing number 18441/40. WATCH OFFICE WITH MET SECTION (2423/39) CL MILITARY DEFENCE AND FORTIFICATION BT FIGHTER SATELLITE STATION WATCH OFFICE UF Watch Office With Meteorological Section (2423/39) WATCH OFFICE (1959/34) SN An all timber constructed watch office with SN A two-storey watch office, built to Air Ministry meterological section. Similar in design to 2328/39 drawing number 1959/34. It became the standard and 5845/39. There were only two known design for watch offices with a large, almost examples built in the UK at Wick and St.Eval. square, ground plan with a central observation CL MILITARY DEFENCE AND FORTIFICATION tower. BT WATCH OFFICE WITH MET SECTION CL MILITARY DEFENCE AND FORTIFICATION WATCH OFFICE WITH MET SECTION (518/40) BT WATCH OFFICE UF Watch Office With Meteorological Section WATCH OFFICE (1960/34) (518/40) SN A two-storey watch office, built to Air Ministry SN A temporary brick and timber watch office based drawing number 1959/34 but with slight design on the all-timber 2423/39. Built after 1941 on modifications as detailed in drawing number many Operational Training Unit airfields the design

35 was superseded by 8936/40. NT WATER TANK CL MILITARY DEFENCE AND FORTIFICATION WATER TOWER BT WATCH OFFICE WITH MET SECTION WATER TANK WATCH OFFICE WITH MET SECTION (5845/39) SN A receptacle for the storage of water. UF Watch Office With Meteorological Section CL MILITARY DEFENCE AND FORTIFICATION (5845/39) BT WATER STORAGE FACILITY SN A two-storey, brick construction with a watch WATER TOWER office and additional rooms given over to the meteorological section, including a forecast room SN A tower serving as a reservoir to deliver water and met store. A brick parapet on the roof at a required point. differentiates it from 2328/39. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT WATER STORAGE FACILITY BT WATCH OFFICE WITH MET SECTION NT WATER TOWER (1178/25) WATER TOWER (20/40) WATCH OFFICE WITH MET SECTION (8936/40) WATER TOWER (9526/41) UF Watch Office With Meteorological Section WATER TOWER (1178/25) (8936/40) SN Based on the previous all-timber design 2423/39 SN A large, circular, reinforced-concrete tank and the temporary brick and timber design supported on concrete staging built to Air Ministry 518/40, the 8936/40 was built with pre-cast drawing number 1178/25 and designed to hold concrete slabs replacing the timber floors and 30,000 gallons of water. The height of the tower staircases with only the balcony and watch varied according to local site requirements. office roof in timber. CL MILITARY DEFENCE AND FORTIFICATION CL MILITARY DEFENCE AND FORTIFICATION BT WATER TOWER BT WATCH OFFICE WITH MET SECTION WATER TOWER (20/40) Watch Office With Meteorological Section (2328/39) SN A plate-steel water tower made with two USE WATCH OFFICE WITH MET SECTION (2328/39) compartments holding 30,000 gallons of water. Designed to Air Ministry drawing number 20/40. Watch Office With Meteorological Section (2423/39) CL MILITARY DEFENCE AND FORTIFICATION USE WATCH OFFICE WITH MET SECTION (2423/39) BT WATER TOWER Watch Office With Meteorological Section (518/40) WATER TOWER (9526/41) USE WATCH OFFICE WITH MET SECTION (518/40) SN A plate-steel water tank on a steel tower designed to hold 80,000 gallons of water. Watch Office With Meteorological Section (5845/39) Designed to Air Ministry drawing number USE WATCH OFFICE WITH MET SECTION (5845/39) 9526/41. Watch Office With Meteorological Section (8936/40) CL MILITARY DEFENCE AND FORTIFICATION BT WATER TOWER USE WATCH OFFICE WITH MET SECTION (8936/40) WEAPON TESTING FACILITY WATCH OFFICE WITH OPERATIONS ROOM SN A site, buildings or structure associated with the CL MILITARY DEFENCE AND FORTIFICATION demonstration and testing of weapons and BT CONTROL TOWER military equipment. Use more specific term. NT WATCH OFFICE WITH OPS ROOM (13079/41) CL MILITARY DEFENCE AND FORTIFICATION WATCH OFFICE WITH OPS ROOM (7345/41) BT DEFENCE SITE Watch Office With Operations Room (13079/41) NT ARTILLERY FIRING RANGE USE WATCH OFFICE WITH OPS ROOM (13079/41) BOMBING RANGE FIRING RANGE Watch Office With Operations Room (7345/41) GRENADE RANGE USE WATCH OFFICE WITH OPS ROOM (7345/41) RIFLE RANGE WATCH OFFICE WITH OPS ROOM (13079/41) WEAPONS PIT UF Watch Office With Operations Room (13079/41) SN Usually a small, two or three man trench, dug as CL MILITARY DEFENCE AND FORTIFICATION an isolated fieldwork rather than as part of a BT WATCH OFFICE WITH OPERATIONS ROOM defensive system. A WWI and WWII feature. CL MILITARY DEFENCE AND FORTIFICATION WATCH OFFICE WITH OPS ROOM (7345/41) BT FIELDWORK UF Watch Office With Operations Room (7345/41) Wireless Telegraphy Station CL MILITARY DEFENCE AND FORTIFICATION BT WATCH OFFICE WITH OPERATIONS ROOM USE RADIO TELEGRAPHY STATION WATER STORAGE FACILITY WOMENS AUXILIARY AIR FORCE CAMP SN A site or building containing tanks and pipes and SN A camp used for the accommodation of members used to store large quantities of water. of the Womens Auxiliary Air Force who CL MILITARY DEFENCE AND FORTIFICATION undertook a variety of essential roles within the BT STORAGE FACILITY RAF to enable their male counterparts to fight more effectively.

36 CL MILITARY DEFENCE AND FORTIFICATION BT MILITARY CAMP WOMENS LAND ARMY CAMP SN A camp used to accommodate members of the Womens Land Army who undertook essential agricultural work during the Second World War. CL MILITARY DEFENCE AND FORTIFICATION BT DOMESTIC SITE WOMENS LAND ARMY HOSTEL SN A hostel used to accommodate members of the Womens Land Army who undertook essential agricultural work during the Second World War. CL MILITARY DEFENCE AND FORTIFICATION BT DOMESTIC SITE WORKSHOP SN A building or room used for small scale manufacture or maintenance. CL MILITARY DEFENCE AND FORTIFICATION BT ANCILLARY BUILDING Y Station USE RADIO TELEGRAPHY STATION Z BATTERY SN An anti aircraft battery armed with 3 inch rockets with a ceiling of 22,000 feet. Both single and multiple launchers were designed. Single launchers being used to defend vulnerable points such as coastal batteries with multiple launchers defending town. CL MILITARY DEFENCE AND FORTIFICATION BT ANTI AIRCRAFT BATTERY Z Station USE RADIO TELEGRAPHY STATION

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