Plaid Cymru has secured a victory in the Caerphilly Senedd by-election, with Lindsay Whittle emerging as the successful candidate. Following the result, Plaid Cymru leader Rhun ap Iorwerth characterized the win as a "historic result" and one of the party's most significant electoral successes. Speaking at a press event held at Caerphilly Castle, ap Iorwerth stated that the outcome provided "clear evidence" of growing public support for Plaid Cymru, asserting that "momentum is with Plaid Cymru now" as the party looks ahead to the 2026 Senedd election. The report indicates that future Senedd elections are being framed as a primary contest between Plaid Cymru and Reform UK.
Source: https://www.theguardian.com/politics/live/2025/oct/24/caerphilly-byelection-result-live-reform-plaid-cymru-labour-wales-welsh-government-senedd-latest-voting-news