Gordon Rayner: Keir Starmer’s full-time job now is clinging to power but his days in Downing Street are clearly numbered

If a lack of curiosity were a resignation matter, Keir Starmer would have handed in his notice by now. Instead, by insisting over and over again that no one told him Peter Mandelson had failed vetting checks, the UK’s prime minister limps on - at least until today.