Voters go to polls in Caerphilly byelection that could mark historic shift for Wales

Plaid Cymru and Reform UK have run fierce campaigns in Labour-run south Wales constituency

Voters are going to the polls in Caerphilly in a byelection that could mark a historic shift in Welsh politics.

Labour has run the Welsh parliament since the devolved administration was established in 1999, and Caerphilly has been one of its strongholds. But opposition parties hoping to form the next Welsh government have run fierce campaigns in the south Wales constituency.

Polling stations opened at 7am on Thursday and close at 10pm, and the result is expected in the early hours of Friday.

In recent polling, Plaid Cymru and Reform UK have been forecast as the two biggest parties in Wales next year. The result in Caerphilly could be a bellwether for the Senedd election in May and is likely to be treated as such by the victorious party.