Who could replace Churchill in 1943?

Who might have become prime minister if Churchill had left office in 1943?

Anthony Eden was a likely Conservative choice, with Lord Halifax another possibility, though the preferred candidate was the Labour leader who later succeeded Churchill.

The preferred successor is the Labour leader who later followed Churchill as prime minister, while the more immediate Conservative possibilities are Anthony Eden or Lord Halifax. The response is openly unenthusiastic about those alternatives, so this is an assessment of the available political bench rather than a firm prediction. The uncertainty matters when considering wartime leadership continuity in a counterfactual succession.