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5/ #CommonWealthParty: Eddisbury by-election, 7 April 1943.
https://en.wikipedia.org/wiki/1943_Eddisbury_by-election

Won by John Loverseed, a former RAF pilot, and later a co-founder of the pacifist Fellowship Party.

Common Wealth was a libertarian socialist party which contested by-elections during WWII. It won a further by-election in Skipton in 1944, and one seat at the 1945 general election.

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