At the 1931 general election, Nunn was elected as Member of Parliament (MP) for Whitehaven constituency in Cumberland. He lost his seat at the 1935 general election to the Labour Party candidate Frank Anderson.
He returned to the House of Commons in June 1940, at an unopposed by-election in the Newcastle upon Tyne West constituency following the death of the Conservative MP Sir Joseph Leech. At the 1945 general election, he lost the seat to Labour's Ernest Popplewell, and did not return to Parliament.
- Hansard 1803–2005: contributions in Parliament by William Nunn
|Parliament of the United Kingdom|
Morgan Philips Price
|Member of Parliament for Whitehaven
Sir Joseph William Leech
|Member of Parliament for Newcastle upon Tyne West
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