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Watch: Plaid Cymru win Caerphilly byelection, beating Reform while Labour trounced

6 1
25.10.2025

Plaid Cymru has defeated Reform UK in a fiercely-fought Senedd by-election, with defending party Labour trailing in third.

Nigel Farage’s party was hoping to win its first seat at the ballot box in the Caerphilly constituency and pledged to “throw everything” at its campaign.

But Plaid has emerged victorious with a majority of 3,848 votes, and a swing of almost 27% from Labour, on a high turnout of more than 50%.

The result will embolden Plaid in its efforts to enter government in Wales next year, and is a bitter blow for Labour, which had held the seat since the Senedd was first established in 1999.

Mr Whittle received 15,961 votes, more than 47% of the total, which is up almost 19% from the 2021 result in the constituency with a swing from Labour of almost 27%.

Reform candidate Llyr Powell got 12,113 votes – the party had only 495 four years ago –........

© South Wales Argus