He was elected at the 1922 general election as Member of Parliament (MP) for Barrow-in-Furness. He was re-elected in 1923, but was narrowly defeated at the 1924 election in a straight contest with the Labour Party candidate John Bromley.
He returned to the House of Commons at the 1929 general election as MP for the north-west London constituency of Willesden East. He held that seat until his death in 1938, aged 58. Somerville died on the same day as his predecessor as MP for Willesden East, George Frederick Stanley.
- "House of Commons constituencies beginning with "B" (part 1)". Leigh Rayment's House of Commons pages. Archived from the original on 17 November 2013. Retrieved 20 April 2009.
- Craig, F. W. S. (1983) . British parliamentary election results 1918–1949 (3rd ed.). Chichester: Parliamentary Research Services. pp. 277, 73. ISBN 0-900178-06-X.
- Hansard 1803–2005: contributions in Parliament by Daniel Somerville
|Parliament of the United Kingdom|
| Member of Parliament for Barrow-in-Furness
1922 – 1924
| Member of Parliament for Willesden East
1929 – 1938
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