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.
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.
This series of publications contains data on various subjects relating to Parliament and Government. Topics include legislation, MPs, select committees, debates, divisions and Parliamentary procedure.
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 papers@parliament.uk with any comments.
We also welcome suggestions for new lists.
This House of Commons Library briefing provides details of the current levels of 'Short money' allocated to opposition parties for parliamentary duties and a brief history of the scheme. Figures for the corresponding scheme in the House of Lords (Cranborne money) are provided. The briefing also provides details of allocations made under the Representative Money scheme.
Fast-tracked bills in the House of Commons
This briefing paper provides an update on developments since the Parliamentary Buildings (Restoration and Renewal) Act 2019 received Royal Assent in October 2019.
