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The 1939 Streatham by-election was held on 7 December 1939. The by-election was held due to the resignation of the incumbent Conservative MP, William Lane-Mitchell. It was won by the Conservative candidate David Robertson. [1]
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | David Robertson | Unopposed | |||
| Registered electors | |||||
| Conservative hold | |||||
