Where a promisor has demonstrated a propensity to defeat the promisee's expectations and the relationship has broken down, immediate transfer of property (a 'clean break') may be the appropriate relief for proprietary estoppel, even where the original promise was testamentary in nature. The potential operation of the Family Provision Act does not bar an equitable estoppel claim, and the prejudice to potential Family Provision Act claimants is relevant only as a discretionary factor that must be supported by evidence of the claimants' financial circumstances and the insufficiency of the estate. The standard of appellate review applicable to the moulding of proprietary estoppel relief (House v The King or correctness) remains unresolved.
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