Rishi Sunak faces a nerve-racking wait till the early hours to see if the Tories have managed to win the three by-elections.
Voters headed to the poll field in Uxbridge and South Ruislip, Selby and Ainsty, and Somerton and Frome, on Thursday with polling closing at 10pm. The outcomes are anticipated within the early hours of Friday.
The Prime Minister braced MPs at a gathering of the 1922 Committee of Tory backbenchers on the eve of the polls that they face a "tough battle" in what had been seen as protected seats for his social gathering.
Labour hopes to take Uxbridge and South Ruislip, Boris Johnson's former London constituency, and Selby and Ainsty in North Yorkshire, which was vacated by his ally Nigel Adams.
The Lib Dems are eying victory within the contest in Somerton and Frome in Somerset that was triggered by David Warburton quitting after admitting cocaine use amid allegations of sexual harassment.
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