Pillans v Van Mierop

Pillans & Rose v Van Mierop & Hopkins (1765) 3 Burr 1663 is a case concerning letters of credit, and the doctrine of consideration. It has been recommended as a landmark case in English contract law. Lord Mansfield tentatively expressed a view that the doctrine of consideration was redundant. However, in "Rann v Hughes" the House of Lords doubted the presumption.
Facts.
Pillans & Rose were in business together as merchant bankers in Rotterdam. They agreed to accept bills from White, an Irish merchant, on one condition. 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. However, before the bills were drawn on Van Mierop, White went insolvent. Van Mierop refused to honour the bills and argued that Pillans had not provided consideration for their guarantee since there was the rule that past consideration is not a good consideration.
Judgment.
Lord Mansfield held that the doctrine of consideration should not be applied to preclude enforcement of promises made in mercantile transactions.
Wilmot J said,