Apparent tip-off by Peter Mandelson gave advance notice of instability that would ripple through global markets Apparent tip-off by Peter Mandelson gave advance notice of instability that would ripple through global markets On a brisk Monday evening in May 2010, Gordon Brown stood on the steps of Downing Street and delivered one of the most dramatic announcements of the New Labour era: his resignation as UK prime minister . The decision came days after a nail-biting general election that left