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.