## Facts

- Mr. Gillett worked for many years on Mr. Holt’s farm.
- Mr. Holt repeatedly assured Mr. Gillett that he would inherit the farm after Holt’s death.
- Relying on these assurances, Mr. Gillett forwent educational opportunities and committed to the farm, expecting future ownership.
- Eventually, the relationship between Gillett and Holt deteriorated.
- Mr. Holt altered his will to remove Mr. Gillett as beneficiary and dismissed him from his position at the farm.
- Mr. Gillett brought a claim for proprietary estoppel after being excluded from the will.
- The trial judge ruled against Mr. Gillett.
- The main dispute centered on whether Holt’s promises were sufficiently irrevocable and whether Mr. Gillett suffered actionable detriment.

## Issues

1. Whether Mr. Holt’s assurances, absent express irrevocability, could ground a proprietary estoppel claim.
2. Whether Mr. Gillett’s actions demonstrated sufficient reliance on the assurances.
3. Whether the detriment suffered by Mr. Gillett was adequate for proprietary estoppel.
4. Whether the three elements of proprietary estoppel—assurance, reliance, and detriment—should be viewed as independent or intertwined factors in assessment.

## Decision

- The Court of Appeal reversed the trial judge’s ruling and found in favour of Mr. Gillett.
- The court held that assurances need not be expressly irrevocable if they create a reasonable expectation of an interest in land.
- Mr. Gillett’s reliance on repeated assurances was presumed given the circumstances; Holt would need to prove a lack of reliance.
- The detriment suffered by Mr. Gillett, including forgone educational and career opportunities, was sufficient to meet the requirement.
- The elements of proprietary estoppel—assurance, reliance, and detriment—are often interconnected and should be evaluated holistically.

## Legal Principles

- Proprietary estoppel requires (i) a clear assurance, (ii) reasonable reliance, and (iii) detriment suffered as a result.
- There is no requirement that an assurance be expressly irrevocable for estoppel to arise; rather, the focus is on reasonable expectation.
- Reliance can be presumed from clear assurances, shifting the burden to the party denying reliance.
- Detriment is not limited to financial loss but may extend to lost opportunities or significant changes made in reliance on assurances.
- The elements of proprietary estoppel should not be rigidly compartmentalized but considered in light of the total circumstances for a just outcome.
- The remedy may be tailored to the circumstances and does not necessarily require transfer of the promised interest.

## Conclusion

Gillett v Holt clarified that proprietary estoppel does not require express irrevocability of assurance; rather, reliance and detriment may be presumed from clear and repeated promises, and detriment encompasses a wide range of disadvantage. The decision established an interconnected and flexible approach to assessing estoppel claims, emphasizing the need to prevent unconscionable outcomes.

Gillett v Holt [2001] Ch 210