The government's Scotland secretary Douglas Alexander has admitted it was a "mistake" to appoint Peter Mandelson and "significant lessons need to be learned" over the vetting process. Speaking to Sophy Ridge on Sky News he said: "Peter Mandelson shouldn't have been appointed as ambassador, the prime minister, never mind myself, accepts that was a mistake. "It is possible that as well as the error in terms of the appointment of Peter Mandelson, there are significant lessons that need to be