"The real test, I think, must be whether upon the facts of the particular case the situation has become such that it would be dishonest or unconscionable for the plaintiff, or the person having the rights sought to be enforced, to continue to seek to enforce it."
"The enquiry which I have to make therefore, as it seems to me, is simply whether, in all the circumstances of this case, it was unconscionable for the defendants to seek to take advantage of the mistake which, at the material time, everybody shared . . ."
"Brightman J. resolved the difficult question of the appropriate quantum of damages by holding that the plaintiffs should recover 5 per cent. of the defendants' expected profit from their venture. In Bracewell v. Appleby, Graham J. applied the same principle where the right in question was not a consent under a restrictive covenant, but an easement of way. I find great difficulty in seeing how these cases help Mr. Macdonald. If the plaintiff has the right to prevent some act being done without his consent, and the defendant does the act without seeking that consent, the plaintiff has suffered a loss in that the defendant has taken without paying for it something for which the plaintiff could have required payment, namely, the right to do the act. The court therefore makes the defendant pay what he ought to have paid the plaintiff, for that is what the plaintiff has lost. The basis of computation is not, it will be observed, in any way directly related to wasted expenditure or other loss that the defendant is escaping by reason of an injunction being refused: it is the loss that the plaintiff has suffered by the defendant not having observed the obligation to obtain the plaintiff's consent. Where the obligation is contractual, that loss is the loss caused to the plaintiff by the breach of contract."
"The plaintiffs therefore seek damages. They have never sought an interim injunction to restrain the defendant from developing the land otherwise than in accordance with the first planning permission. They never sought an injunction at the trial requiring the defendant to pull down the completed houses. They recognised that there was never any practical possibility of such an injunction being granted."
"The difficulty about the decision in the Wrotham Park case is that in Johnson v. Agnew [1980] A.C. 367, 400G, Lord Wilberforce, after citing certain decisions on the scope and basis of Lord Cairns's Act which were not cited to Brightman J., stated in the clearest terms that on the balance of those authorities and on principle he found in the Act no warrant for the court awarding damages differently from common law damages."
"In my view Wrotham Park Estate Co. Ltd. v. Parkside Homes Ltd.[1974] 1 W.L.R. 798 is only defensible on the basis of the third or restitutionary principle . . . The plaintiffs' argument that the Wrotham Park case can be justified on the basis of a loss of bargaining opportunity is a fiction."
"If you promise not to pursue a particular profit-making activity and then do pursue it, nothing is more apt than that you should make restitution of your profits."
"If A, being a liveryman, keeps his horse standing idle in the stable, and B, against his wish or without his knowledge, rides or drives it out, it is no answer to A for B to say: 'Against what loss do you want to be restored? I restore the horse. There is no loss. The horse is none the worse; it is the better for the exercise.'"
"wherever an abstraction or invasion of property has occurred, then, unless such abstraction or invasion were to be sanctioned by law, the law ought to yield a recompense under the category or principle ... either of price or of hire."