Labour faced a significant defeat in its traditional Welsh strongholds, landing in third place in the Caerphilly Senedd by-election. Analysts noted that the outcome signaled serious challenges for the party leading up to the pivotal Welsh Parliament elections in May 2026.
Plaid Cymru secured victory in Caerphilly with a substantial 3,848-vote margin, marking a notable 27% swing from Labour, amidst a turnout exceeding 50%. The early morning results revealed Plaid capturing 47% of the vote share, surpassing Nigel Farage’s Reform UK at 36%.
Having held the Caerphilly seat since its inception in 1999, Labour stumbled to a distant third with a mere 11% share. The Conservative candidate, Gareth Potter, garnered only 690 votes, while the Green Party and Liberal Democrats secured 516 and 497 votes, respectively. Despite a strong campaign effort, Reform fell short in clinching the Welsh seat.
In response to the defeat, First Minister Eluned Morgan acknowledged the challenging circumstances of the by-election and expressed gratitude to Labour’s candidate, Richard Tunnicliffe. Morgan congratulated Lindsey Whittle on his triumph, emphasizing the imperative to address the community’s call for swifter change.
Welsh Labour MP and Europe Minister Nick Thomas-Symonds conceded the tough battle ahead in the upcoming Senedd elections following the defeat to Plaid. He acknowledged the disappointment of Labour’s loss and highlighted the fragmented political landscape in the UK, pledging to heed the community’s demand for accelerated progress.
Polling expert Sir John Curtice indicated that Plaid is strongly positioned to potentially secure the next First Minister of Wales. While acknowledging Reform’s disappointment with the results, Curtice noted the party’s consistent national polling trends.
Plaid Cymru leader Rhun ap Iorwerth hailed the people of Caerphilly for choosing hope and progress over division, endorsing Plaid’s vision for Wales. He lauded Lindsay Whittle’s dedication to the constituency and promised tangible change under Plaid’s leadership, positioning the party as the prime alternative for Wales.
The outcome in Caerphilly underscored the shift towards new leadership, with Plaid emerging as the frontrunner poised to deliver a future that caters to all, signaling Wales’ readiness for change.