“The principle … applies where B adopts a particular course of conduct in reliance on a mistaken belief as to B’s current rights and A, knowing both of B’s belief and of the existence of A’s own, inconsistent right, fails to assert that right against B. If B would then suffer a detriment if A were free to enforce A’s right, the principle applies. It therefore operates in a situation in which it would be unconscionable for A, as against B, to enjoy the benefit of a specific right.”
“[unconscionability] cannot be used as a substitute for the specific requirements of proprietary estoppel. It may however have a ‘very important part to play’ in proprietary estoppel, by ‘unifying and confirming, as it were, the other elements. If the other elements appear to be present but the result does not shock the conscience of the court, the analysis needs to be looked at again.’ Citing Cobbe v. Yeoman’s Row Management Ltd [2008] UK HL 55 at [92] per Lord Walker. ” ‘unifying and confirming, as it were, the other elements. If the other elements appear to be present but the result does not shock the conscience of the court, the analysis needs to be looked at again.’ Citing Cobbe v. Yeoman’s Row Management Ltd [2008] UK HL 55 at [92] per Lord Walker. ”