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Plaid Cymru win Caerphilly Welsh Government by-election holding off Reform UK

Plaid Cymru increased its vote share by nearly 19% to hold Caerphilly, while Reform UK surged to 36% and Labour fell to just 11%, officials said.

  • Plaid Cymru defeated Reform UK in the Caerphilly by-election, winning by a majority of 3,848 votes on a turnout of more than 50%.
  • After the vacancy caused by Hefin David's passing, the by-election took place in Caerphilly, where the Labour Party had held the seat since the Senedd was created in 1999.
  • With 15,961 votes, Lindsay Whittle won while Llyr Powell rose to 12,113 votes, with a swing of almost 27% from Labour.
  • The result will embolden Plaid Cymru in its push to form government next year, as Labour's vote share fell to 11% and Reform UK missed victory by more than 3,000 votes.
  • As the Senedd prepares to switch to proportional representation from 2026, the result raises stakes ahead of next year's full Senedd elections and marks a shift in a region long dominated by the Labour Party.
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Britain's Labour Party suffered a devastating defeat in a by-election in its historic stronghold of Wales, the first time Labour has lost in the Caerphilly constituency in over a hundred years.

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South Wales Argus broke the news in Newport, United Kingdom on Friday, October 24, 2025.
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