Not to forestall further answers, but there was a great answer to a similar question by /u/frederfred1 here in reply to the question [Was the landslide Labor victory in the 1945 UK general election as shocking as it sounds? Churchill is a legendary figure and his party had won the popular vote in every election since 1906; was the outcome a backlash against his leadership style, burnout, or something else?] (https://www.reddit.com/r/AskHistorians/comments/8x0n3v/was_the_landslide_labor_victory_in_the_1945_uk/e205hao/)