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The Guardian - UK
The Guardian - UK
Comment
Editorial

The Guardian view on the Caerphilly byelection: Labour’s collapse in its Welsh heartland signals a wider loss

Plaid Cymru leader Rhun ap Iorwerth, left, and Caerphilly’s new MS, Lindsay Whittle, walk to the Senedd in Cardiff on 24 October 2025.
Plaid Cymru leader Rhun ap Iorwerth, left, and Caerphilly’s new MS, Lindsay Whittle, walk to the Senedd in Cardiff on 24 October 2025. Photograph: Matthew Horwood/Getty Images

The Caerphilly byelection only looks local if you ignore what it represents: the quiet unravelling of the democratic world’s most successful election-winning machine. For more than a century, Labour has been the dominant party in Wales. Its grip had survived deindustrialisation, Thatcherism and even the slow death of its working-class institutions. Now that seems to be ending – not through scandal or drama, but through a lack of moral imagination.

What happened in this small valleys seat, where Labour lost a heartland base to Plaid Cymru while Reform UK menaced from the right, is the result of a Downing Street mentality that mistakes competence for conviction and caution for strategy. Welsh Labour has not helped itself – vicious infighting had left it fractured and demoralised. As Labour controls both the Welsh and UK parliaments, there’s nowhere to hide. The trouble is that Sir Keir Starmer promised change and delivered continuity. Caerphilly looks like a reckoning.

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