House of Commons Library

Members' Changes of Allegiance

Published Wednesday, July 6, 2016

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.

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Is there a by-election if an MP changes Party?

By-elections are not automatically triggered if an MP changes his or her party affiliation.

Role of the Whips Office

Information on the role of the Government and Opposition whips in the management of parliamentary business can be found in the Commons 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 he list. Please email with any comments.


Commons Briefing papers SN02537

Author: Sarah Priddy

Topics: House of Commons, Members of Parliament, Political parties

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