Thanks for this Peter.
Why does there need to be a statute? Isn’t it (at least if the plaintiff’s argument is correct) the same type of claim that has always been available where a person who is only secondarily liable pays a debt that someone else was primarily liable to pay?
Of course the primary/secondary question may require statutory interpretation, but this is not the case, for example, where a guarantor pays the debt of a primary debtor—the analogy that was, I think, relied upon in Brook’s Wharf.
On that view, mistake is irrelevant—but I don’t think mistake was part of the claim in Brook’s Wharf. The conclusion about primary/secondary is enough to tell you that something is not as it should be as between the person who paid and the person who was
primarily liable to pay.
Whether unjust enrichment is relevant to this claim is a much more difficult question..
Lionel
More unjust-enrichment madness, as I see it, out of the English courts yesterday. Again only a strike out decision, but there will be many more of those whilst a free-ranging unjust enrichment concept is on the loose.