If a stranger to a trust (a) receives and becomes chargeable with some part of the trust fund or (b) assists the trustees of a trust with knowledge of the facts in a dishonest design on the part of the trustees to misapply some part of a trust fund, he is liable as a constructive trustee (Barnes v Addy ((1874) LR 9 Ch App 244 at 251–252) per Lord Selborne LC).
— Buckley LJ. Belmont v Williams [1980] 1 ALL ER 393