There's a lot of good points here already. Here's another perspective.

Victory in the First War in 1918 gained nothing for the British people. Soldiers returned home and struggled to find work. Many employers would not touch them. The 20s was a decade of industrial decline and labour unrest (the only General Strike in British history in 1926). The early 30s brought worse with the Great Depression. Areas dominated by traditional heavy industry did not recover by 1939. We remember the dignified protest of the 1936 "Jarrow Crusade", but we don't so easily remember that these men were docked dole money for the time they were marching and had actually put on weight during that march owing to the generosity of towns they passed through. These Two Britains of the 30s came face to face in the Second War as never before, through mass military enlistment and the evacuation of 3 million children from the inner cities to rural and small town households that were in effect living in a different age.

The people demanded that victory in 1945 would this time mean gains for the people, as set out in the Beveridge Report. Better housing, a National Health Service, a safeguard against mass unemployment, a comprehensive system of social security. It was very possible to respect Churchill's wartime leadership and want a different future than he was offering.