Keir Starmer’s claim he was “staggered” not to have been told of Peter Mandelson’s vetting failure has provoked incredulity across Westminster and accusations that he sacked a senior civil servant to save his premiership.

Senior government figures said the prime minister faced “judgment day” next week when Olly Robbins, who is understood to be furious at being forced to quit the Foreign Office, is expected to appear before a powerful committee of MPs.

Ciaran Martin, a former senior civil servant with past involvement in vetting work, who is a close friend of Robbins, told the BBC that the sacked official appeared to have been made a scapegoat.