Rishi Sunak is facing a by-election triple threat after the Somerton and Frome vote was scheduled for 20 July.

The announcement comes after David Warburton formally left the House of Commons on Monday.

The election will take place on the same day as Boris Johnson’s vacated Uxbridge and South Ruislip seat, and Nigel Adams’ Selby and Ainsty seat.

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There is still no answer on when Nadine Dorries will leave her Mid Bedfordshire constituency, after saying she was “standing down with immediate effect” almost two weeks ago.

Mr Warburton announced he was standing down as an MP last week, having been suspended from the Conservative Party since April 2022 while being investigated by the Independent Complaints and Grievance Scheme (ICGS).

He had been accused of sexual harassment and drug abuse.

In his resignation letter, Mr Warburton said the “malicious allegations” and “flawed” 14-month investigation had “inflicted unimaginable and intolerable destruction on my family and on [himself]”.