He contested Belper unsuccessfully at the 1924 general election, losing by over 4,000 votes to the sitting Conservative Party MP Herbert Wragg. At the 1929 election he took the seat with a majority of 2,955, but at the 1931 general election Wragg retook the seat with a majority of nearly 8,000. He stood again at Belper in the 1935 general election but was again defeated. Lees did not stand for Parliament again.
- Craig, F. W. S. (1983) . British parliamentary election results 1918–1949 (3rd ed.). Chichester: Parliamentary Research Services. ISBN 0-900178-06-X.
- Leigh Rayment's Historical List of MPs
- Hansard 1803–2005: contributions in Parliament by Jack Lees
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|Member of Parliament for Belper
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