Senior civil servant Sue Gray has resigned after being controversially offered the job of Labour leader Sir Keir Starmer’s chief of staff.

i understands that Ms Gray, who rose to prominence last year after writing a report into breaches of Covid-19 lockdown rules at Downing Street gatherings, has left her role at the Cabinet Office.

Sky News has reported that she has accepted the role working for Sir Keir, subject to approval by the Advisory Committee on Business Appointments (Acoba) .

i earlier reported that current Prime Minister Rishi Sunak may move to block the appointment, under Acoba rules.

The move has prompted concern among allies of Boris Johnson, who suggested the former Prime Minister would be in “a total frenzy of rage”.

Ms Gray had previously refused to comment on the reports that she is in talks with Labour, which would make her one of the party’s most senior figures in the run-up to the next general election.

Former members of Mr Johnson’s team expressed disbelief at the prospect of Ms Gray, whose son is a Labour activist, joining Sir Keir’s office.

One ex-aide said: “It just can’t be true – it would be too absurd.” Another added: “I’m sure she is someone of the utmost integrity and professionalism and all the usual caveats, but surely the civil service goons should stop this. Boris will be in a total frenzy of rage about this.”

Conservative MP Sir James Duddridge told i : “I think Sue should take legal action as this impugns her character and standing. She is not my favourite civil servant but this seems an unreasonable punishment for her.”

This story is being updated.

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