This list notes when a Member has changed allegiance from one political party to another or decided to sit as an independent MP. Instances of Members losing or resigning a party whip are also noted.Jump to full report >>
No, by-elections are not automatically triggered if an MP changes his or her party affiliation although an MP may choose to stand down and fight the ensuing by-election under a new party label or as an independent Member.
Information on the role of the Government and Opposition whips in the management of parliamentary business can be found in the Commons Library briefing on The Whips Office.
Due to the difficulties in compiling a comprehensive list of all floor-crossings, whip withdrawals and whip resignations, this list cannot be guaranteed to be definitive.
We are always happy to hear of any additions or amendments to the list. Please email email@example.com with any comments.
Commons Briefing papers SN02537
Author: Sarah Priddy