Cameron Thomas, the Liberal Democrat MP for Tewkesbury, was arrested on suspicion of assault and controlling and coercive behaviour, the BBC reports. He was taken into custody on Wednesday night and subsequently released on police bail.

The Liberal Democrats moved swiftly. The party suspended Thomas's whip pending the outcome of the police investigation, meaning he now sits as an independent MP. Suspension of the whip — the parliamentary party's disciplinary lever — does not remove Thomas from the Commons, nor does it trigger a by-election. He remains the elected member for Tewkesbury unless he resigns, is disqualified, or the rare process of a recall petition is successfully completed.

Controlling and coercive behaviour is a criminal offence under the Serious Crime Act 2015, typically prosecuted where a pattern of psychological or physical abuse is alleged within an intimate or family relationship. It carries a maximum sentence of five years. Arrest on suspicion does not indicate charge or conviction; Thomas is presumed innocent.

The party's speed in withdrawing the whip reflects the approach now standard across Westminster since a series of misconduct scandals sharpened parliamentary party procedures over recent years. Lib Dem leader Sir Ed Davey has previously been vocal on standards, which made inaction here a political as well as an institutional impossibility.

Tewkesbury is a constituency in Gloucestershire — traditionally fertile ground for the Liberal Democrats, who have made significant gains across the South West in recent electoral cycles. The seat's political complexion means the suspension is unlikely to have immediate arithmetic consequences for any party's Commons majority, but it adds Thomas's name to a growing list of members across parties whose personal conduct has become a matter for police rather than the whips' office alone.

Thomas has not made any public statement, as reported. Police bail conditions, if any, have not been disclosed.