DOCUMENT 5.10.2.1 Historic Environment Desk Study Report Chapter 10 – Appendix 1 National Grid (North Wales Connection Project) Regulation 5(2)(a) including (l) and (m) of the Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009 Application Reference EN020015 September 2018 Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 i North Wales Connection Project Volume 5 Document 5.10.2.1 Appendix 10.1 Historic Environment Desk Study Report National Grid National Grid House Warwick Technology Park Gallows Hill Warwick CV34 6DA Final September 2018 North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 ii Page intentionally blank North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 iii Document Control Document Properties Organisation Wood Environment & Infrastructure Solutions UK Limited Author Mike Glyde Approved by Simon Atkinson Title Historic Environment Desk Study Report Document Reference Document 5.10.2.1 Version History Date Version Status Description/Changes September Rev A Final Final for submission 2018 North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 iv Page intentionally blank North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 v Contents 1 Introduction 1 1.1 Outline of Proposed Development 1 2 Legislation and Policy Context 1 2.1 Legislation 1 2.2 Policy 1 3 Approach and Method 3 3.1 Study Areas 3 3.2 Data Sources 4 3.3 Survey 6 4 Baseline Description 8 4.1 Section A Wylfa To Rhosgoch 8 4.2 Section B Rhosgoch to Llandyfrydog 21 4.3 Section C Llandyfrydog to Plas llanddyfnan 28 4.4 Section D B5110 north of Talwrn to west of Star 37 4.5 Section E and F WEST OF STAR to pentir 42 5 References 66 Figures 69 Annex A - List of designated heritage assets A Annex B - Description of designated heritage assets in Sections A-D B Annex C - Non-designated heritage assets on HER C Annex D - List of buildings marked on 2nd edition OS mapping D Annex E - List of aerial photographs viewed E Annex F - Historic landscape aspect area descriptions F Annex G - Registered park and garden descriptions G Annex H - Selected site photographs H North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 vi Page intentionally blank North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 Page 1 1 Introduction 1.1 OUTLINE OF PROPOSED DEVELOPMENT The Proposed Development 1.1.1 National Grid Electricity Transmission (plc) (National Grid) is seeking powers to construct, operate and maintain a new 400,000 volt (400 kV) connection between Wylfa Substation on Anglesey and Pentir Substation in Gwynedd, together with various associated development and other works (“‘The Proposed Development”’). 1.1.2 National Grid is proposing to use a combination of overhead line and an underground tunnel for the connection. Cable sealing end compounds are proposed at the interface points between the overhead and tunnel heads. The proposals include: extension to the existing substation at Wylfa; sections of new 400 kV OHL between Wylfa substation and Braint Tunnel Head House (THH) and Cable Sealing End Compound (CSEC) on Anglesey including modifications to parts of the existing 400 kV OHL between Wylfa and Pentir; Braint THH/CSEC on Anglesey; a tunnel between Braint and Tŷ Fodol THHs; Tŷ Fodol THH/CSEC in Gwynedd; new section of OHL connection between Tŷ Fodol THH/CSEC and Pentir Substation; extension to the existing substation at Pentir; and Temporary construction compounds, access tracks, construction working areas, localised widening of the public highway and third party works that are required to construct the infrastructure listed above. North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 Page 1 2 Legislation and Policy Context 2.1 LEGISLATION 2.1.1 Schedule 9 of the Electricity Act 1989 (HMSO, 1989) places a duty on all transmission and distribution licence holders to: ‘…. have regard to the desirability of preserving natural beauty, of conserving flora, fauna and geological or physiographical features of special interest and of protecting sites, buildings and objects of architectural, historic or archaeological interest;’ 2.1.2 The Planning (Listed Buildings and Conservation Areas) (Wales) Regulations 2012 (TSO, 2012) provides for the definition and protection of listed buildings and conservation areas. Section 66 of the Act places a duty on the determining authority to have special regard to the desirability of preserving a listed building and its setting in considering whether to grant permission for development which affects these. 2.1.3 The Infrastructure Planning (Decisions) Regulation (2010) (HMSO, 2010) sets out the duties of the decision maker in respect of the desirability of preserving designated historic assets in their setting. 2.2 POLICY National Policy 2.2.1 The principal national policy statement covering energy infrastructure is the Overarching National Policy Statement for Energy (EN-1) (Department of Energy and Climate Change , 2011). This notes the need to conserve and enhance the historic environment, to submit sufficient information with an application and to take account of effects on historic assets and their setting. 2.2.2 National Policy Statement for Electricity Networks Infrastructure (EN-5) (Department of Energy & Climate Change, 2011) contains policy specific to electricity networks but provides no further guidance on historic environment. 2.2.3 National policy in Wales is set out in Planning Policy Wales (Edition 9, 2016), Chapter 6 of which covers the historic environment. North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 Page 2 2.2.4 Technical Advice Note 24: The Historic Environment (TAN 24), adopted in May 2017, provides guidance on how the planning system should consider the historic environment during development plan preparation and decision making on planning applications. Local Policy 2.2.5 Development Plan policy relevant to the scope of this assessment is provided in the Joint Local Development Plan (Anglesey and Gwynedd), adopted in July 2017 (JLDP). 2.2.6 Local Plan policies are listed in ES Appendix 10.6 (Document 5.10.2.6). North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 Page 3 3 Approach and Method 3.1 STUDY AREAS 3.1.1 This desk based assessment presents the currently known baseline historic environment data for a study area defined at the stage when the Scoping Report1 was in preparation. This ‘scoping corridor’ extended from Wylfa on the north coast of Anglesey to Pentir on the mainland in Gwynedd. This is c.35 km long, and varies in width between 1.5 km and 4.8 km. For the purpose of the description, the scoping corridor is divided into six sections. Sections A-D cover Wylfa to near Llanfairpwllgwyngyll, and section E and F covers the crossing of the Menai Straight to the Pentir Substation. The boundary of the study area is shown in Figure 1. 3.1.2 The report included the following appendices: Annex A: List of designated assets; Annex B: Descriptions and reasons for listing (where applicable) of designated heritage assets within Sections A - D. Due to the size of Sections E & F which contains 174 Listed Buildings, these are omitted from the Annex; Annex C: List of HER records within study area compiled in numerical order; Annex D: List of isolated farmsteads and cottages present on the 1881 2nd edition OS map of with property name and grid reference; Annex E: List of aerial photographs consulted at the National Monuments Record (Wales); Annex F: Descriptions of Historic Landscape Aspect Areas (HLAAs); Annex G: Descriptions of Registered Parks and Gardens within study area; and 1 https://infrastructure.planninginspectorate.gov.uk/projects/wales/north-wales- connection/?ipcsection=docs North Wales Connection Project Environmental Statement Appendix 10.1 Historic Environment Desk Study Report Document 5.10.2.1 Page 4 Annex H: Selected photographs taken during walkover surveys illustrating key heritage assets and general views of historic landscapes. 3.2 DATA SOURCES 3.2.1 A range of readily available sources of historic environment data have been accessed to provide a baseline description. This has involved a desk study of land within the study area, which reviewed the following sources: available excavation reports and other reports on archaeological investigations within the study area; all extant aerial photographic (AP) evidence held at the Royal Commission on Ancient and Historical Monuments in Wales (RCAHMW), Aberystwyth. In particular photographs were studied to identify any previously unrecorded features of potential significance. Such features were mainly noted on vertical aerial photographs; o only verticals with a ground scale of 1:10000 or less were assessed for heritage assets due to the ground resolution. o 155 Vertical photographs were identified during the search, although one run 540/464 (11/05/1951) was not available to view. o most images were unfortunately large scale (no specific scale identified on the photo or record), however some were evidently sub 1:10,000. o prints were all small (c25cmx25cm) of variable print quality, some being crisp with good contrast, others quite dark with low contrast, particularly 541/178 (08/10/1948). The latter made identification of heritage features impossible. o oblique 35 mm print and slides and medium format images were checked and copies made of relevant sites.