Should I report this thread for getting my hopes up every time I see the title? 
More likely, ask the Speaker of the House of Commons to do so.
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As I understand 1939, Churchill was the noisiest critic about appeasement and the danger of Germany. When he proved to be fatally right and Poland was invaded despite feeding the wolf what it wanted, there really wasn’t anyone else who had the credibility to become the leader of a war government - which IIRC was a coalition of all parties, to avoid factional infighting during a time of crisis.
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Not quite. Chamberlain’s government continued in office in 1939, with Churchill back at his old job in charge of the Navy. He didn’t entirely escape criticism over the failure of intervention in Norway in April 1940 (shades of Gallipoli 1915). But when it became clear in the subsequent debate that confidence in Chamberlain was waning fast, and he was persuaded to go because Labour would not join a government led by him, there were two obvious candidates, Churchill and Halifax. The Tory Chief Whip got them together to ask their views. Churchill said nothing; Halifax mentioned the potential difficulties of having a PM in the House of Lords, and that was that.