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9/ #SocialDemocraticParty (#SDP): Crosby by-election, 26 November 1981
https://en.wikipedia.org/wiki/1981_Crosby_by-election
Shirley Williams was the first MP to be elected to the Commons as an SDP candidate. More than 20 sitting Labour MPs & one Conservative had defected to the SDP, but Williams was the first elected in SDP colours.
Williams was defeated in 1983, after unfavourable boundary changes. She never returned to the Commons.
The SDP merged with the Liberals in 1988, only 7 years after the SDP's creation.
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