‘Where one person, A, has acted to his detriment on the faith of a belief, which was known to and encouraged by another person, B, that he either has or is going to be given a right in or over B’s property, B cannot insist on his strict legal rights if to do so would be inconsistent with A’s belief.’
“…it is important to note at the outset that the doctrine of proprietary estoppel cannot be treated as subdivided into three or four watertight compartments. Both sides are agreed on that, and in the course of the oral argument in this court it repeatedly became apparent that the quality of the relevant assurances may influence the issue of reliance, that reliance and detriment are often intertwined, and that whether there is a distinct need for a ‘mutual understanding’ may depend on how the other elements are formulated and understood. Moreover, the fundamental principle that equity is concerned to prevent unconscionable conduct permeates all the elements of the doctrine. In the end the court must look at the matter in the round.”
“The aim [of the remedy] remains what it has always been, namely the prevention or undoing of unconscionable conduct. In many cases, once the equity is established, then the fulfilment of the promise is likely to be the starting point, although considerations of practicality, justice between the parties and fairness to third parties may call for a reduced or different award. And justice between the parties may be affected if the proposed remedy is out of all proportion to the reliant detriment, if that can easily be identified without recourse to minute mathematical calculation, and proper regard is had to non-monetary harm.”
“Take the example where the daughter spends the whole of her working life on the family farm, working at low wages, in the promised expectation that she will inherit it. The question whether giving her the farm is disproportionate is not to be answered in such a case simply by comparing the monetary value of the farm with the net present value of the wages differential. Modern capital values of farmland are typically so high that the farm would always be worth much more than any valuation of the detriment. But that does not make a full in specie enforcement of the expected inheritance disproportionate. It will be proportionate (or at least not out of all proportion) because the daughter has fulfilled her part of the family understanding, and it is only fair and proportionate that the parents should now perform theirs.”
“Michael Spencer was a very capable farmer and the results of the firm in terms of its financial performance are and were far better than many similar size farms which reflects on a very capable farming policy and extreme hard work on behalf of Michael Spencer and his family.”
“In the end the court will have to consider its provisional remedy in the round, against all the circumstances, and ask itself whether it would do justice between the parties, and whether it would do injustice to third parties. The yardstick for that justice assessment will always be whether, if the promisor was to confer the proposed remedy upon the promisee, he would be acting unconscionably. “Minimum equity to do justice” means, in that context, a remedy which will be sufficient to enable that unconscionability question to be answered in the negative.”