Detriment (in the sense of a prejudicial change of position) remains a necessary element of proprietary estoppel, notwithstanding suggestions in some authorities that it may not be a separate element. An oral promise to give a share of property 'when the time comes', without evidence of irrevocability, is akin to a revocable testamentary promise and is insufficient to found proprietary estoppel. Where the plaintiff's detriment is nil or very minor, relief proportionate to the expectation (e.g., half the property value) will not be granted; at most, compensation for loss of a chance may be appropriate.
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