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The 1940 Southwark Central by-election was held on 10 February 1940. The by-election was held due to the death of the incumbent Labour MP, Harry Day. It was won by the Labour candidate John Hanbury Martin. [1]
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | John Hanbury Martin | 5,285 | 64.3 | +11.0 | |
| Anti-War | Charles W. Searson | 1,550 | 18.9 | ||
| National | Violet Van der Elst | 1,382 | 16.8 | ||
| Majority | 3,735 | 45.4 | |||
| Turnout | 8,217 | ||||
| Labour hold | Swing | ||||
