Rishi Sunak faces one other doubtlessly embarrassing by-election after a former Tory MP resigned with instant impact following allegations of sexual harassment and cocaine use.

David Warburton has stood down from his seat of Somerton and Frome, hitting out in an exit assertion of an “extraordinarily difficult” 14 months combating “malicious allegations in two connected investigations”. He stated he had been prevented by the Independent Complaints and Grievance Scheme (ICGS) from “speaking out” whereas it probed the accusations and advised that in resigning he could be “laying bare” what he regards as flaws within the system.

“It is my hope that, in so doing, I can freely illuminate the methods of an oversight system not fit for purpose, so that friends and colleagues in the House can see the perverted process by which their own judgment may at any time be freighted,” Mr Warburton stated.

The resignation will set off a by-election in his constituency.

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Mr Warburton took the seat from the Liberal Democrats in 2015 and had a 19,213 majority however the opposition occasion is already stepping up manoeuvres to reclaim it.

Lib Dem Deputy chief Daisy Cooper stated: “Time after time the Conservatives have mired themselves in sleaze and scandal neglecting the issues that really matter to people. Then they decided it was okay to leave local people in this seat without any proper representation at all.

“This by-election will be a clear contest between the Conservatives and the Liberal Democrats, Labour finished third last time and are completely out of the race. The people of Somerton and Frome need a local champion and they can have that at the next election by choosing our local Liberal Democrat candidate Sarah Dyke.”

The Express reported in April that Mr Warburton was admitted to a psychiatric hospital after medication and sexual harassment allegations have been made about him. His spouse, Harriet, stated he had extreme shock and stress however had no additional remark.

Mr Warburton was suspended by the Conservative whips' workplace after the allegations of sexual harassment and drug use have been made.

The Sunday Times reported on the time that the 56-year-old allegedly stripped bare and climbed into the mattress of a youthful lady he had met by politics.