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1a/ #LabourRepresentationCommittee: Woolwich by-election, 11 March 1903.
https://en.wikipedia.org/wiki/1903_Woolwich_by-election

Won by Will Crooks of the Labour Representation Committee (LRC). This was the first contested by-election won by the LRC

Crooks was a noted trade unionist. Apart from a break in 1910, he served as an MP until his death in 1921.

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1903 Woolwich by-election - Wikipedia

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1/ #LabourRepresentationCommittee: Clitheroe by-election, 1 August 1902. https://en.wikipedia.org/wiki/1902_Clitheroe_by-election

Won by David Shackleton of the Labour Representation Committee (LRC), who was returned unopposed. Immediately after the 1906 general election, the 29 LRC MPs renamed the group as the #LabourParty.

Shackleton left the Commons in 1910, to become a senior civil servant.

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1902 Clitheroe by-election - Wikipedia