England president during World War 2?

England has no President, but a Prime Minister instead. At the outbreak of war in 1939, this was Neville Chamberlain, but he resigned in 1940 to be replaced by Sir Winston Churchill. Churchill was a Conservative, but during the war years the UK had a coalition government made up of all the political parties working together.
Soon after the end of the war in Europe in May 1945, there was a General Election which saw the coalition disbanded and Churchill swept from office to be replaced by Clement Attlee, who headed a Labour Government. It was he who was Prime Minister when the war ended in the Far East, in August 1945.
Churchill was re-elected again as Prime Minister from 1950 - 55.