Caerphilly vote tests politics as Reform UK and Plaid challenge Labour

Voters in Caerphilly cast ballots Thursday in a Senedd byelection that could mark a major shift in Welsh politics, with votes being counted overnight at Caerphilly leisure centre and a result expected in the early hours of Friday. The contest was triggered by the death of Hefin David, the Welsh Labour member who had represented the constituency since 2016. Labour has held the Senedd seat since devolution in 1999 and the wider area has been dominated by Labour representation at Westminster since 1918.

Campaign polling in the run-up to the vote placed Reform UK and Plaid Cymru well ahead of Labour, with polls showing Reform in the lead and Plaid close behind while Labour trailed. Party officials and campaigners at the count said the race is essentially a two‑way contest between Reform and Plaid, with turnout likely to determine the outcome. Election officials at the count said the declaration could come around 2am, though the timing remained uncertain.

Reform’s candidate, Llŷr Powell, appealed directly to local concerns on the doorstep, urging voters to “vote for a better future” and to “bring money back to Caerphilly.” Nigel Farage, a senior figure in Reform, said the contest...