She paved the way for Boris Johnson’s downfall with her investigations into Partygate, and then became the central organiser of Sir Keir Starmer’s operation in No 10. But Sue Gray has now stepped back from her controversial role as the Prime Minister’s chief of staff following weeks of rumoured infighting between senior aides in Downing Street.

Sue Gray has quit her role as Prime Minister Sir Keir Starmer's chief of staff. A Downing Street spokeswoman confirmed Ms Gray will take up a new role as the PM's envoy for nations and regions. This breaking news story is being updated and more details will be published shortly.

Keir Starmer’s most senior adviser has resigned just three months after Labour’s UK general election win, a major blow to the premier following weeks of internal infighting and mounting criticism of his political operation.