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 on Thursday 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.