This extract from the book “Parliamentary Party Groups in European Democracies” gives information about the British parliamentary parties with regard to the following topics: formal status; historical background; current organization; cohesion; position of the individual representative; relation to the extra-parliamentary organization; relation to interest groups; and relation to government formation.

https://www.routledge.com/Parliamentary-Party-Groups-in-European-Democracies-Political-Parties-Behind/Heidar-Koole/p/book/9780415223362