He led the British (as Prime Minister) in WW2
May 1940
Neville Chamberlain
The Prime Minister at the start was Neville Chamberlain he was replaced shortly before Dunkirk by Winston Churchill.
If you are asking who Winston Churchill's predecessor - the previous Prime Minister of the United Kingdom was.
Winston Churchill was a prime minister
British Prime Minister : Winston Churchill .
soldier
David Lloyd George
prime minister, Winston Churchill
He was prime minister from 1940 to 1945..
In June 1953 Winston Churchill was Prime Minister of Great Britain