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The 1940 Southampton by-election was held on 1 February 1940. The by-election was held due to the elevation to the peerage of the incumbent Liberal National MP, Sir Charles Barrie. It was won by the National candidate Sir John Reith. [1]
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| National | John Reith | Unopposed | |||
| National gain from National Liberal | |||||
