Full results and key stats from Selby and Ainsty, Somerton and Frome and Uxbridge and South Ruislip by-elections

Rishi Sunak suffered two heavy defeats in safe Tory seats after a night of three by-election results.

Labour won Selby and Ainsty and the Lib Dems took Somerton and Frome on sizable swings which will leave many Conservative MPs looking nervously at their own majorities. But Labour failed to secure victory in Boris Johnson’s former seat of Uxbridge and South Ruislip, with Tory Steve Tuckwell holding on with a majority of just 495.

In Selby and Ainsty, 25-year-old Keir Mather will become the youngest MP in the Commons – the Baby of the House – after overturning a 20,137 majority. For the Lib Dems, a 29.0 percentage point swing in Somerton and Frome saw a 19,213 Tory majority turned into a 11,008-vote cushion for new MP Sarah Dyke.

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Here are some of the key facts and statistics from the results of Thursday’s by-elections:

– Selby and Ainsty

Labour’s victory at Selby and Ainsty has made history: it is the largest Conservative majority (20,137) overturned by the party at a by-election since 1945. The previous record was set at the Mid Staffordshire by-election in March 1990, when Labour overturned a Tory majority of 14,654.

To win the seat, Labour needed a swing in the share of the vote of 17.9 percentage points: the equivalent of a net change of 18 in every 100 people who voted Conservative at the 2019 general election switching sides. They managed a swing of 23.7 points: the largest achieved by Labour at by-election since it won Dudley West from the Tories in December 1994 (29.1 points) and the second largest swing managed by Labour at a by-election since 1945.

The Conservative share of the vote in Selby dropped sharply from 60 per cent at