UK by-election results: all you need to know in chart form

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Rishi Sunak suffered double by-election defeats in safe Tory seats, with Labor and the Liberal Democrats both overturning majorities of around 20,000.

Labour won Selby and Ainsty and the Liberal Democrats dragged Somerton and Frome into major swings that will leave many Tory MPs staring nervously at their own majorities s.

But the Tory leader was free from the prospect of being the first prime minister since 1968 to lose three by-elections on the same day as Labor failed to claim victory in Boris Johnson's former seat of Uxbridge and South Ruislip. Labor's victory at Selby and Ainsty went down in history as the largest Conservative majority (20,137) overturned by the party in a by-election since 1945.

The previous record was set in the Mid Staffordshire by-election in March 1990, when Labor overturned a Tory majority of 14,654.

To win the seat, Labor needed a 17.9% vote share. points: the equivalent of a net change of 18 out of 100 people who voted for the Conservatives in the 2019 general election by switching sides.

They achieved a change of 23.7 points: the biggest change achieved by Labor in a by-election since winning Dudley West against the Conservatives in December 1994 (29.1 points) and the second biggest change managed by Labor in a by-election since 1945.

The Conservative share of the vote in Selby has fallen sharply from 60% in the 2019 general election to 34%, while Labor's share has risen from 25% to 46%.

Winner Keir Mather, 25, will become the youngest MP in the House of Commons.

– Somerton and Frome

(PA Wire)

Somerton and Frome is the...