A Reform Party member of the Welsh Senedd has switched allegiance to Plaid Cymru, marking the latest shift in the chamber’s political landscape following the May election. The defection comes just weeks after the party secured its largest-ever representation in the assembly, raising questions about internal cohesion and future alliances. With Plaid now holding more seats than Reform, the move could further reshape coalition dynamics ahead of legislative sessions. The decision follows a pattern of cross-party movement in the Senedd, where shifting loyalties often influence policy direction and governance.
Sarah Cooper-Lesadd, one of 34 Reform MSs elected in May's Senedd election, defected to Plaid on Tuesday.
