Labour party had been winning parliamentary seats before the war.
Labour had support over the Conservatives and by 1943 their lead was between 10-20%
Trade Unions played a key role in the war and promoted the standing of the Labour Party
The war changed people's attitudes towards the class system. The Labour Party promoted allowing all people to access opportunities.
Labours key leaders had all helped during war Clement Attlee, Ernest Bevin, Herbert Morrison were progressive and popular with the people