Sir Keir Starmer is bracing for another day under scrutiny as former top civil servant Sir Olly Robbins prepares to answer MPs questions on the appointment of Lord Peter Mandelson as US ambassador. Sir Olly was sacked from his post as head of the Foreign Office last week, with the prime minister blaming him for deliberately keeping him in the dark over Lord Mandelson’s failure to pass security vetting check. Sir Keir told the Commons on Monday that he would not have appointed Lord Mandelson if