Whelpdale v Cookson (1747) 27 ER 856 is an English trusts law case, also relevant for UK company law, on the duty of loyalty owed by a trustee to beneficiaries of the trust.
[1] Trustee not to derive advantage from a purchase of trust property.
On devise of lands in trust for payment of debts, the trustee himself parchases part.
Lord Chancellor said, he would not allow it to stand good, although another person being the best bidder bought it for him at a public sale; for he knew the dangerous consequence: nor is it enough for the trustee to say, you cannot prove any fraud as it is in his own power to conceal it; but if the majority of creditors agreed to allow it, he should not be afraid of making the precedent.
For a statement of the particulars of the case, the directions more at length, and a reference to the general law on such subjects, see the Supplement, p.8, &c., to which add Gibson v. Jeyes, 6 Ves.