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Theresa May was rocked by the resignation of yet another senior staffer today as her top spin doctor dramatically quit Downing Street.

Well-respected Number 10 press secretary Lizzie Louden quit the Tory Government and told pals she will “move on to other things”.

Ms Louden had previously worked on the controversial - but highly successful - Vote Leave campaign.

She was Mrs May's most senior political spinner left in Downing Street following the sudden resignation of communications director Katie Perrior earlier this week.

(Image: Twitter)

It comes amid reports of a grim atmosphere inside Number 10 under the leadership of Mrs May and her all-powerful chiefs of staff Nick Timothy and Fiona Hill since they came to power last July.

One source told the Financial Times that the mood has turned “from day to night” under the new regime.

“Number 10 is in crisis as all their top spin doctors jump ship," Lib Dem leader Tim Farron said today.

“Even they can’t defend Theresa May’s divisive hard Brexit plans.”

In a message to friends today Ms Louden said: “I have taken the decision to leave Government.

“It has been the most amazing and historic nine months. It was thrilling to be part of it.”

A Number 10 spokesman said: "We thank Lizzie for her dedication and hard work.

"She will be missed by her colleagues, who want to wish her every success in the future."

It comes three days after her boss Ms Perrior quit within hours of the election being announced, saying she “never intended” to fight a general election with Mrs May.

The resignation of the PM's two main political spin doctors in the same week is a bitter blow to the Tories as they try to ramp up their PR for the election campaign.

And it comes hot on the heels of a succession of high-profile resignations after Mrs May came to power last year.

Her official spokeswoman Helen Bower – Whitehall's most respected comms chief – quit in December following reports of angry bust-ups with Mrs May's top aides.

She has now joined Boris Johnson's team as director of communications at the Foreign Office.

Ms Bower's deputy, Greg Swift, then quit to become a spinner for Brexit Secretary David Davis.

Britain's EU Ambassador Sir Ivan Rogers quit in January with a devastating attack on Mrs May's “muddled thinking” over Brexit .

The PM's national security adviser Mark Lyall-Grant quit in February after reportedly falling out with Mrs May.

And they all followed Northern Powerhouse guru Jim O'Neill, who quit as a Treasury Minister within weeks of the PM coming to power over her lack of support for his infrastructure projects.

Even Bank of England governor Mark Carney announced he was quitting two years early following the arrival of Mrs May in Downing Street.