SUE Gray was today accused by ministers of breaking FOUR civil service rules after taking a job as Sir Keir Starmer’s top aide.
Tory MPs skewered the Partygate inquisitor for secretly “conniving” with Labour - and said her appointment stinks like a “rotting fish”.
But the dodgy hire risked backfiring as Cabinet Office Minister Jeremy Quin raised a series of possible breaches.
In a fiery Commons session he said she had failed to notify the official watchdog Acoba before being offered the position.
She was also rapped for not getting permission for talks with the Opposition, nor declaring any meetings she held and even potentially breaking the civil service code.
Sir Keir had earlier refused six times to reveal when he first started speaking with Ms Gray about the chief of staff job and was urged to come clean.
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Mr Quinn, the Paymaster General, fumed: “There are now serious questions as to whether Labour, by acting fast and loose, undermined the rules and the impartiality of the civil service.”
Ms Gray’s resignation as a top Whitehall mandarin last week to join Sir Keir’s team has sparked fury from Tory MPs.
Ex-Cabinet Minister Jacob Rees-Mogg said the move “smashed to pieces the idea of an independent civil service, when we know that one of the most senior civil servants in the country was conniving in secret meetings with the party of opposition.”
He warned it undermined her Partygate probe into Boris Johnson, "which we now know was done by a friend of the socialists."
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Fellow Tory Craig Whittaker piled in: "If the process looks like a rotting stinking fish, if it smells like a rotting stinking fish, and it tastes like a rotting stinking fish, chances are it's a rotting stinking fish."
Labour’s deputy Angela Rayner shot back that Conservatives were indulging in “conspiracy theories”.
Earlier Sir Keir tried to turn the tables by attacking Mr Johnson’s attempts to give his dad Stanley a knighthood.
He raged: “It's classic of a man like Johnson. I mean, I think the public will just think this is absolutely outrageous."
Ms Gray triggered a mammoth backlash from Tory MPs after she quit government late last week to join Labour.
Allies of Boris Johnson today seized on the appointment as evidence her Partygate probe last year was a stitch-up.
Ex-Cabinet Minister Jacob Rees-Mogg said the hire "smashed to pieces the idea of an independent civil service, when we know that one of the most senior civil servants in the country was conniving in secret meetings with the party of opposition."
He threw into doubt Ms Gray's Partygate probe "which we now know was done by a friend of the socialists."
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Labour's Angela Rayner tried to defend the controversial hire and shot back that BoJo's pals were "indulging in the conspiracy theories of the former prime minister".
Earlier Sir Keir refused six times to explain when he first approached Ms Gray with the job offer.
Who is Sue Gray? Partygate inquisitor who wants to become Starmer's top aide
By JACK ELSOM, Political Correspondent
BEFORE the December of 2021, nobody outside Westminster had ever heard of Sue Gray.
But her name was soon on everyone’s lips as the nation waited months for her report into Downing Street parties during lockdown.
Her verdict was damning, accusing Boris Johnson and other leaders of creating a culture of booze that led to ministers and officials breaking the rules they had inflicted on the country.
From a trove of texts, pictures and interviews she painted a picture of brazen debauchery that saw staff be rude to cleaners and throw up in No10.
The hammer blow sparked the steady spiral of the PM that ultimately led to his resignation.
Her appointment as Sir Keir Starmer’s top aide last night caused uproar with critics casting doubt on the entire probe.
Gray, 65, was never meant to lead the inquiry and was only asked when the Cabinet Secretary recused himself after being revealed to have attended a gathering.
Her appointment was widely welcomed, with Theresa May’s former chief of staff Gavin Barwell saying he couldn’t think “of a better person to put in charge of this review”.
Through a lifetime in the civil service she had built a reputation as a no-nonsense fair dealer of integrity.
At the time she was the second ranking mandarin in the new Levelling Up Department following stints at the Cabinet Office and Finance Department.
In 2012 as Whitehall’s ethics chief she oversaw the Plebgate inquiry into Chief Whip Andrew Mitchell calling the Downing St cops “plebs”.
Ahead of Partygate, Gray’s influence at the heart of government - for which is paid more than £150,0000 - led to her being dubbed “the most powerful person you’ve never heard of.”
But within SW1 she was well reputed as a hardened operator, famed for running a pub in Newry, Northern Ireland in the 1980s at the height of the Troubles with her husband Bill.
Their son Liam is chair of the Labour Party Irish Society and a vocal party activist.
Yet the enigmatic mandarin has been known to let her hair down and belt out Grease on karaoke.
Yesterday she brought the curtain down on her Whitehall career in spectacular fashion, resigning as second permanent secretary at the Cabinet Office with immediate effect.
And she wants to be back in a department she has never conquered - No10 Downing St.