Richard Gordon Armstrong v Simon James Armstrong & Anor

A proprietary estoppel claim requires an unambiguous promise or assurance intended to be taken seriously, reasonable reliance, and substantial detriment caused by that reliance. Clarity is context-dependent. Detriment is assessed broadly and in the round, including countervailing benefits. Where a promisor has created a long-standing and reasonable expectation of inheritance, repudiating it may be unconscionable even though testamentary freedom is ordinarily protected. The remedy aims to prevent or undo unconscionable conduct. Fulfilment of the promise may be the starting point, but practicality, fairness and third-party interests may require a different or reduced award.

Richard Armstrong claimed against his late father Alan’s estate. He alleged that Alan and Margaret had repeatedly promised that he would inherit North Cowton Grange Farm, where he had lived and worked for decades. He relied on those assurances by pursuing farming rather than another career, remaining at North Cowton, assuming business liabilities and executing a deed of variation that transferred Margaret’s estate to Alan.

Alan’s 2020 will left North Cowton to his grandson George and made no provision for Richard. Richard brought a primary proprietary estoppel claim and an alternative claim under the Inheritance (Provision for Family and Dependants) Act 1975. The central issues were whether enforceable assurances were made, whether Richard reasonably relied on them to his substantial detriment, whether repudiation was unconscionable, and what financial provision was reasonable.

1. Proprietary estoppel. Richard succeeded. The assurances that he would inherit North Cowton were unambiguous, intended to be taken seriously and reasonably understood as promises on which he could rely. They were repeated over more than 30 years and were reinforced by the parties’ wills, the separation of the farm businesses and the April 2019 deed of variation.
2. Richard reasonably relied on the assurances. His reliance included choosing farming rather than university and another career, working at North Cowton for about 34 years on modest remuneration, assuming responsibility for substantial partnership liabilities, and surrendering his interest in Margaret’s estate through the deed of variation. These acts were causally connected to the assurances and caused substantial detriment.
3. The court assessed detriment broadly and in the round. Rent-free occupation and drawings from the farming partnership were countervailing benefits, but they did not outweigh Richard’s substantial net detriment. Exact financial quantification was unnecessary.
4. Alan repudiated Richard’s reasonable expectation by executing the 2020 will. Given the duration and nature of the promises, and Richard’s irreversible change of position, repudiation was unconscionable. Margaret had not acted unconscionably because her will remained consistent with the assurances.
5. The appropriate proprietary-estoppel remedy was adjourned for a further hearing. The court stated that prevention or undoing of unconscionable conduct, rather than automatic expectation fulfilment or detriment compensation, is the governing aim. Fulfilment may be the starting point, subject to practicality, justice and fairness.
6. 1975 Act claim. In the alternative, Richard was eligible under section 1(1)(c) and was financially dependent on Alan. Alan’s will failed to make reasonable financial provision for him. The court deferred the precise award pending determination of the proprietary-estoppel remedy, but indicated that a clean break and appropriate indemnities might be required.