If Labour loses the Senedd seat, it will be a huge blow for party that has dominated politics in Wales for a century

If Labour loses the Senedd seat, it will be a huge blow for party that has dominated politics in Wales for a century

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

Outcome of byelection in historically Labour stronghold could mark historic shift in Welsh politics

Rhun ap Iorwerth’s party, which wants Wales to become independent, seizes Senedd seat after Reform UK challenge

Labour come third with just 11% of vote in a seat that has long been one of its strongholds

Plaid Cymru’s byelection victory signals a seismic shift in Welsh politics that will rattle Westminster

Plaid Cymru are ‘now well placed to provide Wales with its next first minister’, Sir John said

Predictions of a Reform win were wide of the mark. But Labour’s crushing byelection defeat offers important lessons too, says Guardian columnist Will Hayward

Rhun ap Iorwerth says party’s win was more than just rejection of immigration-obsessed Reform or rudderless Labour