Senedd 2026: Wales Heads to the Polls With Plaid Cymru Tipped to Top the Vote

Wales goes to the polls on 7 May for what analysts describe as a potentially transformative Senedd election, with Plaid Cymru on course to top the vote for the first time in the parliament’s history and Labour fighting to prevent Reform UK from displacing it as the second-largest force in Welsh politics.

The election is the second to be contested under the expanded 96-seat Senedd arrangements introduced in the previous parliamentary term, which increased the number of members and changed the electoral system to use closed party lists on a regional basis. The larger chamber and different voting method have altered the dynamics of Welsh electoral competition significantly.

Plaid Cymru’s projection to lead the poll reflects a steady accumulation of support built over several electoral cycles and a perception, reinforced by focus group research, that the party is seen as more closely attuned to specifically Welsh concerns than either of the UK-wide parties. Its positioning on health, Welsh language policy and economic development has successfully differentiated it from Labour, which has governed Wales in Senedd coalition arrangements for most of the devolved era.

Reform UK’s Welsh polling, running in the mid-to-high twenties in several surveys, suggests the party has successfully tapped into working-class disillusionment in post-industrial south Wales — constituencies that Labour once held with seemingly permanent majorities. The party’s messaging on immigration, public spending efficiency and what it describes as the cultural agenda of the political establishment has resonated strongly in these communities.

The possible outcome of no party holding a majority raises complex questions about government formation in Cardiff Bay. A Plaid-led administration might require support from Labour or the Greens, while a Labour administration would need either Plaid or Liberal Democrat backing to be viable.