Reform UK has made a contentious debut as the official opposition in the Senedd (Wales's devolved parliament), weeks after finishing second in May's elections with 29% of the vote — up from just 1% in 2021. The party's members have sparked walkouts, tears, and a formal complaint after one MS made inflammatory remarks distinguishing between Ukrainian and Sudanese refugees and alleging Indian nurses were taking Welsh jobs, prompting a rebuke from the Senedd's presiding officer. With Reform holding more than a third of seats and set to chair five parliamentary committees, observers warn that its blend of populist disruption and legislative inexperience — including a bloc of its own members accidentally voting against party policy — will test both the new Plaid Cymru minority government and the broader functioning of the chamber.