She served as a councillor in West Sussex from 1971-74 until she was elected Member of Parliament (MP) for Northampton North in 1974. She had previously contested Tonbridge in the 1970 general election.
Colquhoun was Britain's first openly lesbian MP. She punched a car park attendant in a row about a parking ticket in December 1974, and in 1977, after 'years of notoriety' in the house, she was deselected as a parliamentary candidate by her party. She was married with three children, and divorced in 1980 after leaving Parliament.
She published an autobiography in 1980
- Centre for Advancement of Women in Politics
- Jeffery-Poulter, Stephen (1991). Peers, Queers, and Commons: The Struggle for Gay Law Reform from 1950 to the Present. Routledge. pp. 136–8. ISBN 0-415-05760-4.
- BBC News - Scandals Past, 22 December 1998
- Colquhoun, Maureen (10 November 1980). Woman in the House. Scan Publications. ISBN 0-906360-05-6.
- Everything 2 article on Colquhoun, consulted 31May 2010
- Times Guide to the House of Commons 1979
- The Almanac of British Politics 1999
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|New constituency||Member of Parliament for Northampton North