May 10th 1940 when Chamberlain resigned & again when the Conservatives won the General Election in 1951.
Great Britain
1939 to 1940, Prime Minster Neville Chamberlain. 1940 to 1945, Prime Minster Winston Churchill.
Neville Chamberlain until 10 May and then Winston Churchill
Winston Churchill was the Prime Minster of England during WWII. England was part of the Ally forces not the Axis powers.
Because he was prime minster of Great Britain during WW2
Canada: William Lyon Mackenzie King. Great Britain: Winston Churchill
Winston Churchill was democratically elected by the British electorate, he was Prime Minster of the United Kingdom of Great Britain and Northern Ireland.
Neville Chamberlain was the Prime Minister of Britain between 28th May 1937 and 10th May 1940, he was succeeded by Sir Winston Churchill, Churchill was Prime Minster between 10th May 1940 and 26th July 1945.
Chamberlain was diplomatic instead of forceful with Hitler -APEX
Winston Churchill was prime minister since 1940 to 1945
Winston Churchill was prime Minister twice from 1940-1945 (WW2)and again from 1951-1955.
Winston Churchill.