Born in Darlington, Cocks was educated at Plymouth College and became a journalist. He joined the Independent Labour Party and wrote several tracts for the party and for the Union of Democratic Control. He stood unsuccessfully for Maidstone in the 1923 general election. He was elected to the safe seat of Broxtowe in the 1929 general election.
Cocks held Broxtowe until his death in Hendon in 1953 aged 70.
- Hansard 1803–2005: contributions in Parliament by Seymour Cocks
|Parliament of the United Kingdom|
George Alfred Spencer
|Member of Parliament for Broxtowe
1929 – 1953
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