The Green Party of England and Wales is today celebrating a significant by-election win by taking the Grangetown seat on Cardiff council from Labour. The result underlines Greens’ growing support across south Wales while showing support for Labour slipping away. The Green Party believes it is now on course to elect its first Green Member of the Senedd (MS) in the upcoming Caerdydd Penarth constituency contest in 2026.
This strong showing in a traditionally all-Labour ward signals a new challenge to Labour in their stronghold in south Wales and sets the tone for the upcoming Senedd elections in 2026.
The Green Party is targeting the constituency of Caerdydd Penarth where it hopes it can gain at least one member of the Senedd, likely to be the Leader of the Wales Green Party, Anthony Slaughter. Slaughter, who came second in Cardiff South and Penarth at the 2024 UK General Election, is now widely tipped to win a seat in 2026 Senedd elections.
Commenting on yesterday’s by-election in Grangetown.
“This result in Grangetown proves what we’ve always known: people want someone willing to work hard for their communities,” said Anthony Slaughter. “This is another sign of the Green vote surging here despite Labour’s traditional dominance. It’s clear people are feeling let down by Labour and want a fresh political choice: one rooted in fairness, sustainability, and community. We now stand on the brink of electing our first Green MS in Caerdydd Penarth, through a wholly proportional system where our support can finally translate into representation.”