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In the 1906 general election he was elected to Parliament for King's Lynn as a Liberal, but in October 1906 crossed the floor to sit as a Liberal Unionist. In the January 1910 general election he unsuccessfully stood for election at West Salford and in December 1910 was also defeated at Walthamstow.
In 1911 Bellairs was married to Charlotte, daughter of Colonel H. L. Pierson of Long Island, USA. From 1913 he was a member of the London County Council as Municipal Reform Party member for Lewisham, resigning on 17 April 1915.
He returned to Parliament as Conservative member for Maidstone at a by-election in February 1915, and was re-elected for the Maidstone division of Kent in 1918. He retired from Parliament at the 1931 general election, having declined a baronetcy in 1927.
Charlotte Bellairs died in 1939. Carlyon Bellairs lived at 10 Eaton Place, London and Gore Court, Maidstone, Kent, and was a member of the Carlton Club and the Coefficients dining club of social reformers set up in 1902 by the Fabian campaigners Sidney and Beatrice Webb. He died in Barbados.
- The London Gazette: . 21 March 1902.
- David Butler and Gareth Butler, Twentieth Century British Political Facts 1900-2000, eighth edition, Macmillan 2000, p. 244
- Michael Stenton and Stephen Lees, Who's Who of British Members of Parliament Volume III 1919-1945, Harvester Press, 1979, p. 26
- "Obituary: Commander C. Bellairs". The Times (London, England). 24 August 1955. p. 9.
- Portraits of Carlyon Bellairs at the National Portrait Gallery, London
- Hansard 1803–2005: contributions in Parliament by Carlyon Bellairs
|Parliament of the United Kingdom|
Thomas Gibson Bowles
|Member of Parliament for King's Lynn
1906 – January 1910
Thomas Gibson Bowles
|Member of Parliament for Maidstone
1915 – 1931
Sir Alfred Bossom
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