Starmer’s chief of staff, who has quit over Mandelson appointment, was accused of presiding over a toxic No 10 McSweeney resigns as PM’s chief of staff UK politics live – latest updates Starmer’s chief of staff, who has quit over Mandelson appointment, was accused of presiding over a toxic No 10 McSweeney resigns as PM’s chief of staff UK politics live – latest updates In the early hours of 5 July 2024, Keir Starmer arrived at Tate Modern in central London to celebrate Labour’s landslide