Plaid Cymru wins Caerphilly by-election against Reform

Plaid Cymru’s Lindsay Whittle won the Caerphilly by-election on October 24, 2025, defeating Reform UK with a majority of 3,848 votes, while Labour fell to third place. This victory marks a significant shift, as Labour had held the seat since the Senedd’s establishment in 1999, highlighting a growing support for Plaid Cymru’s pro-Wales vision.

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