PM admits he ‘made a mistake’ on appointment of peer to Britain’s top diplomatic posting Sign up for the View from Westminster email for expert analysis straight to your inbox Get our free View from Westminster email Get our free View from Westminster email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Prime minister Sir Keir Starmer says he beat himself up over the appointment of Peter Mandelson as Britain’s ambassador