Pillans & Rose v Van Mierop & Hopkins (1765) 3 Burr 1663 is a case concerning letters of credit, and the doctrine of consideration.

White had to make sure Van Mierop & Hopkins, a big London firm, would guarantee the bills.

Van Mierop confirmed that they would do so and would guarantee a pre-existing duty of White to pay Pillans.

Lord Mansfield held that the doctrine of consideration should not be applied to preclude enforcement of promises made in mercantile transactions.

If a man agrees that he will do the formal part, the law looks upon it (in the case of acceptance of a bill) as if actually done.