Licences and proprietary estoppel

Proprietary estoppel arises when three elements are satisfied (Thorner v Major [2009] UKHL 18): (1) a representation or assurance that the claimant has or will acquire rights in land; (2) reliance by the claimant on that assurance; (3) detriment suffered making it unconscionable for the representor to resile. The remedy is discretionary, aimed at the 'minimum equity to do justice' (Jennings v Rice [2002] EWCA Civ 159), proportionate to detriment rather than automatically fulfilling expectations (Guest v Guest [2022] UKSC 27). Once established, the estoppel equity constitutes an equitable interest capable of binding third parties through registration (s 32 LRA 2002) or as an overriding interest under para 2, Sch 3 if coupled with actual occupation (Chaudhary v Yavuz [2011] EWCA Civ 1314). The doctrine operates as an exception to formality requirements (s 2(5) LPMPA 1989), preventing unconscionable conduct where informal assurances have induced detrimental reliance.

Thorner v Major [2009] UKHL 18: Established the modern tripartite test requiring representation, reliance and detriment; assurances must be 'clear enough' in context. Critical for showing that oblique statements over decades can suffice in familial contexts.

Jennings v Rice [2002] EWCA Civ 159: Introduced the 'minimum equity to do justice' principle, awarding £200,000 rather than house worth £435,000. Establishes that remedies must be proportionate to detriment, not automatic expectation-fulfilment.

Guest v Guest [2022] UKSC 27: Supreme Court confirmed proportionality in remedies, holding relief must be 'conscionable and proportionate'. Shows courts may impose conditions (payment to siblings) to achieve fairness.

Chaudhary v Yavuz [2011] EWCA Civ 1314: Held that inchoate estoppel equity can constitute an overriding interest before crystallisation into specific remedy. Critical for understanding when estoppel binds third parties.

Crabb v Arun District Council [1976] Ch 179: Established court's 'widest discretion' in fashioning relief; granted easement without compensation. Demonstrates how unconscionable conduct affects remedial calibration.

Courts apply a structured analysis: First, identify whether assurance was sufficiently clear in context—oblique statements suffice in long familial relationships (Thorner) but not commercial negotiations (Cobbe v Yeoman's Row [2008] UKHL 55). Second, establish reliance—once assurance and detrimental conduct are proved, reliance is presumed (Greasley v Cooke [1980] 1 WLR 1306). Third, assess detriment from claimant's perspective—must be substantial (expenditure, labour, foregone opportunities). For remedies, courts balance expectation against detriment, considering proportionality and changed circumstances. Against third parties: on registered land, check if equity is protected by notice (s 32) or constitutes overriding interest through actual occupation (para 2, Sch 3), subject to obviousness and inquiry exceptions (para 2(b),(c)). Distinguish from constructive trusts in domestic contexts where doctrines overlap (Yaxley v Gotts [2000] Ch 162).

Students routinely assume expectation equals remedy—post-Jennings, courts award proportionate relief, not automatic transfers. Always apply the Thorner tripartite test systematically; missing any element is fatal. In third-party scenarios, failure to analyse registration consequences loses major marks: apply s 29 LRA 2002, consider notice protection and overriding interests. Don't mechanically apply estoppel to commercial 'subject to contract' negotiations—Cobbe excludes these. Distinguish licence categories (bare/contractual/coupled with interest) and remember Street v Mountford: exclusive possession plus term plus rent creates tenancy, not licence, regardless of label. State when the equity arises for priority—Chaudhary suggests immediately upon unconscionability, not court order.