“50. To recapitulate: there is a category of case in which the benefactor and the claimant have reached a mutual understanding which is in reasonably clear terms but does not amount to a contract. I have already referred to the typical case of a carer who has the expectation of coming into the benefactor’s house, either outright or for life. In such a case the court’s natural response is to fulfil the claimant’s expectations. But if the claimant’s expectations are uncertain, or extravagant, or out of all proportion to the detriment which the claimant has suffered, the court can and should recognise that the claimant’s equity should be satisfied in another (and generally more limited) way. 51. But that does not mean that the court should in such a case abandon expectations completely, and look to the detriment suffered by the claimant as defining the appropriate measure of relief. Indeed in many cases the detriment may be even more difficult to quantify, in financial terms, than the claimant’s expectations. Detriment can be quantified with reasonable precision if it consists solely of expenditure on improvements to another person’s house, and in some cases of that sort an equitable charge for the expenditure may be sufficient to satisfy the equity (see Snell’s Equity 30th ed para 39-21 and the authorities mentioned in that paragraph). But the detriment of an ever-increasing burden of care for an elderly person, and of having to be subservient to his or her moods and wishes, is very difficult to quantify in money terms. Moreover the claimant may not be motivated solely by reliance on the benefactor’s assurances, and may receive some countervailing benefits (such as free bed and board). In such circumstances the court has to exercise a wide judgmental discretion.”