In Great Britain, it was David Lloyd-George.
Bill English
no
Winston Churchill was PM during WW2 : 1940 through 1945.
From 1911-1920 the Prime Minister of Canada was Sir Robert Borden.
worst PM of NZ
Peter Fraser was the pm of New Zealand during WW2 however, New Zealand did not take part in the war.
In the UK, Neville Chamberlain
H.H. Asquith
John Curtin - to participate in the defence of Autralia after the Japanese entered the war in 1941, rather than leaving them fighting in a European war.
Clement Attlee
King George VI was king throughout World War II.