Full Breakdown
Dan Thomas Steps Down as Reform UK Wales Leader Following Police Arrest
By Drooid · · How we work
Core Event
Dan Thomas announced his resignation as leader of Reform UK in Wales, citing “personal reasons.” The decision came after he was reported to the police over the weekend and subsequently released without charge. Thomas, the Senedd member for Casnewydd Islwyn, said he did not want the media attention surrounding the investigation to distract his party’s work in the Welsh parliament.
Background & Context
Reform UK appointed Thomas as its Welsh leader in February 2026. In the May 2026 Senedd election the party surged from two seats to 34, becoming the second-largest group and the official opposition to the Plaid Cymru-led government. The rapid growth followed a strategy to target traditional Labour strongholds in the South Wales valleys. Thomas, a former Conservative councillor and former leader of Barnet Council, had defected to Reform UK the previous year.
Data & Statistics
- 2021 Welsh election vote share for Reform UK: 1%
- 2026 Welsh election vote share: 29%
- Seats won in 2026: 34 of 96, making Reform the largest opposition group in Senedd history
Official Statements & Responses
- Dan Thomas issued a statement saying he was “released without charge,” had “done nothing wrong,” and would continue to serve his constituents while supporting the selection of a new party leader.
- Gwent Police confirmed that a 45-year-old man from the Aberbargoed area was arrested on suspicion of assault and controlling or coercive behaviour and has been bailed pending further enquiries.
Criticism & Opposition
Ken Skates’ remarks highlight concerns within Welsh Labour that Reform’s leadership choices undermine credibility. Plaid Cymru’s chair, Marc Jones, echoed this sentiment, arguing that the party’s focus on opposition tactics detracts from constructive governance. The Conservative leader’s comment, while acknowledging due process, implies a broader pattern of problematic defections to Reform UK.
Verbatim Quotes
- “On Sunday 13 September a 45-year-old man, from the Aberbargoed area, was arrested on suspicion of assault and engaging in controlling/coercive behaviour. He has been bailed pending further enquiries.” — Gwent Police
- “On Sunday 13 September, a 45-year-old man, from the Aberbargoed area, was arrested on suspicion of assault and engaging in controlling/coercive behaviour. He has been bailed pending further inquiries.” — Gwent police
- “Reform UK is descending into chaos.” — February. Plaid Cymru, senedd group chair
These quotations capture the police description of the arrest, the consistent reporting of the incident, and Plaid Cymru’s characterization of Reform UK’s conduct in Wales.