Proprietary Estoppel
Proprietary Estoppel Key features PE is an equitable informal mode of creating any kind of interest in land. Ramsden v Dyson (1876), Kingsdown: “If a man, under a verbal agreement with a landlord for a certain interest in land, or … under an expectation, created or encouraged by the landlord, that he shall have a certain interest, takes possession of such land, with the consent of the landlord, and upon the faith of such promise or expectation, with the knowledge of the landlord, and without objection by him, lays out money upon the land, a Court of equity will compel the landlord to give effect to such promise or expectation.” Willmott v Barber, Fry initially laid out strict test (C makes mistake as to legal rights; C performs acts in reliance on mistake; D knows of the existence of his own inconsistent right; D knows of C’s mistake; D encouraged C’s mistake or abstained from asserting his legal rights). Oliver in Taylors Fashions said these are not strict rules – the modern broader question is whether in “all the circumstances … it was unconscionable for [D] to seek to take advantage of the mistake which, at the material time, everybody shared.” Cobbe and Thorner adopt this. PE, unlike other estoppel, can found a claim for an interest in land (a sword, not just a shield) – Crabb v Arun DC (1976) (Denning: “proprietary estoppel … does give rise to a cause of action”). PE can also be defence to O trying to enforce strict rights. PE is based on preventing unconscionable conduct - Taylors Fashions Ltd v Liverpool Victoria Trsutees Co Ltd (1982) (Oliver: “equitable jurisdiction to interfere … where the assertion of strict legal rights is … unconscionable”) - Gillett v Holt (2001) (Walker: “the fundamental principle that equity is concerned to prevent unconscionable conduct permeates all the elements of the [PE] doctrine”) In a PE claim, after facts satisfying requirements arise, an inchoate equity arises (this entitles C to go to court); when C makes a claim, the court decides how best to use discretion to satisfy the equity.
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