Former chief whip Wendy Morton has referred an allegation that Sir Gavin Williamson sent “abusive” messages to her for an independent investigation by a parliamentary watchdog.

The Cabinet Office minister was already facing an internal Conservative Party investigation over the series of threatening messages reportedly send to Ms Morton complaining he had been excluded from the Queen’s funeral.

But now the Independent Complaints and Grievance Scheme will also look at the allegations.

Sir Gavin, a backbencher at the time the messages were allegedly sent, accused Ms Morton of using the death of the monarch to “punish” senior MPs who were out of favour with Liz Truss’s government.

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The messages, which were originally obtained by The Sunday Times, concluded with Sir Gavin saying: “Well let’s see how many more times you **** us all over. There is a price for everything.”

Former Conservative Party chairman Jake Berry has claimed he told Prime Minister Rishi Sunak that Ms Morton had submitted a formal complaint about Sir Gavin’s conduct the day before he entered Number 10.

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On Sunday, Cabinet Office minister Oliver Dowden told Sky News’ Sophy Ridge on Sunday programme that Mr Sunak knew there was a “difficult relationship” between Sir Gavin and Ms Morton, but “wasn’t aware” of “specific allegations”.

Yesterday, the PM told broadcasters it is “right” for an independent complaints investigation to take place into accusations of bullying made again Sir Gavin “before making any decisions about the future”.

The PM’s official spokesman added that Mr Sunak has full confidence in him.

The Guardian has reported that Sir Gavin also allegedly told a senior civil servant to “slit your throat” while he was defence secretary.

The latest accusation comes as Mr Sunak faces mounting pressure over Sir Gavin’s position.

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An ex-official from the Ministry of Defence told the newspaper that Sir Gavin also told them to “jump out of the window”, in what they felt was a sustained campaign of bullying.

According to The Guardian, the civil servant, who later left government, said Sir Gavin “deliberately demeaned and intimidated” them on a regular basis.

But in a statement, Sir Gavin said: “I strongly reject this allegation and have enjoyed good working relationships with the many brilliant officials I have worked with across government.

“No specific allegations have ever been brought to my attention.”

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Work and Pensions Secretary Mel Stride told Sky News earlier today that it would be “utterly, utterly unacceptable” if Sir Gavin made the alleged remarks.

“If that is the case, that is utterly, utterly unacceptable, but at the moment it is in the realm of media speculation,” he said.

Mr Stride said he served in the Whips’ Office under Sir Gavin, and saw him as someone with “this sort of aura or mystique around him”.

“There was always this great aura of… do you remember Cronus, the spider, the tarantula etc? And the reality with Cronus is he was much touted but he never actually was released to bite anybody,” he told Kay Burley.

“So that was how I always saw Gavin – as somebody who had this sort of aura or mystique around him, but the reality was he just generally got on with his job.”

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Mr Stride said he is “not going to speculate on anybody’s future”, but when probed on whether he believes Sir Gavin will still be a Cabinet Office minister by Christmas, added: “I suspect the answer to that is yes.

While the senior civil servant who made the allegations is said to have reported the incidents informally to the MoD’s head of human resources, they decided against making a formal complaint.

However, they said a senior military aide working in the department later apologised to them for not calling out his behaviour.

A Cabinet Office spokesman said: “The Cabinet Office has not received notice of any formal complaints about Gavin Williamson’s behaviour from his time at the Ministry of Defence or any other department.”

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Sir Gavin served as defence secretary from November 2017 until May 2019, but was fired by then-PM Theresa May over a row around a leak from government.

He was hired back by Boris Johnson as education secretary two months later, but was again ousted in September 2021 after much criticism of his handling of the brief during the COVID pandemic.

Mr Sunak brought him back into government two weeks ago to serve as a Cabinet Office minister who also attends cabinet.

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