A proprietary estoppel action can found a cause of action and is used where a party (B) seeks to assert a proprietary right to land belonging to another party (A) in circumstances where B has been lead to believe, by a promise, words or conduct and/or by acquiescence from A, that they (B) have or can expect to acquire an interest in the land. Detriment and countervailing benefit Regarding the issue of detriment and countervailing benefit, in the case of Rawlings v Chapman, HHJ David Cooke in summarising the law on proprietary estoppel stated that: ‘In considering what detriment the claimant has suffered, the court must take into account any countervailing benefits that she has received, such as residing in the owner’s