Success of the SDP
The breakaway Labour MPs would have an uphill task emulating the SDP’s early success. It fought its first by-election in the July 1981 — losing by 1,700 votes in Warrington. Yet that autumn it reached 50 per cent in the opinion polls, with by-election triumphs following in Crosby, in November 1981, and Glasgow Hillhead in March 1982.

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