When Sir Keir Starmer first approached Sue Gray early last year to be his chief of staff, he believed the veteran civil servant would bring her long Whitehall experience to Labour’s preparations for government.

Campaign Director Morgan McSweeney was immediately announced as her replacement. Often described as Labour’s election guru, he is seen as the mastermind behind Sir Keir’s succession from Jeremy Corbyn and the party’s landslide victory on July 4.

As the brains behind Starmer’s leadership campaign, McSweeney (47) is credited with having brought the prime minister to power. He entered No 10 as head of political strategy, in charge of charting the party’s path to another victory in five years’ time.

Morgan McSweeney, who led Labour’s general election campaign, is reported to have clashed with outgoing chief of staff Sue Gray.

Morgan McSweeney has become the prime minister's chief of staff, after Sue Gray quit the role saying "intense commentary" around her position "risked becoming a distraction". It followed weeks of criticism and briefings against Ms Gray,

A Left-wing think tank which was formerly run by Morgan McSweeney donated £10,000 towards his wife’s bid to be elected as an MP. Labour Together gave the money to Imogen Walker, who is married to Sir Keir Starmer’s new chief of staff,

Labour election guru Morgan McSweeney will take over as Sir Keir Starmer’s chief of staff, after Sue Gray quit citing fears she was “becoming a distraction” to the government.The author of the “Partygate” report has been a high-profile figure in Sir Keir’s top team since she was appointed while Labour was in opposition last year.