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Reform Wales MS Defects to Plaid Cymru

Plaid Cymru’s ruling body must approve the move, which would cut Reform to 33 seats and lift Plaid to 44 in the Welsh Parliament.

  • On Tuesday, Pen-y-Bont Bro Morgannwg MS Sarah Cooper-Lesadd defected from Reform to Plaid Cymru, stating her former party is "not serious about governing Wales" and prioritizes division over solutions.
  • This shift follows Reform leader Dan Thomas stepping down over the weekend after an arrest; Thomas, released without charge, said he did not want to "be a distraction" from his team's work.
  • Cooper-Lesadd, a 31-year-old care leaver elected in May, rejected Reform's tactics, stating she "cannot support Reform's attacks on people seeking sanctuary" and described the Senedd group as a staging post for Nigel Farage.
  • Plaid Cymru Senedd Group Chair Marc Jones confirmed Cooper-Lesadd as the party's 44th Member of the Senedd, leaving Reform with 33 seats following the formal internal process required by party constitution.
  • Welsh Labour and the Welsh Liberal Democrats criticized Reform's instability just four months after the election, questioning the party's choices and arguing it lacks serious leadership to address challenges facing Wales.
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The Cooper-Lesadd move leaves Reform with 33 seats in the Welsh Parliament, and Plaid Cymru has 44.

·London, United Kingdom
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BBC News broke the news in London, United Kingdom on Tuesday, September 15, 2026.
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