Guide to spelling, punctuation and grammar

Opening paragraph
The landslide victory of the Labour Party in the 
1945 election was one of the biggest upsets in British
electoral history. 
(1)
The Conservative Party, under
the leadership of the then Prime Minister Winston
Churchill, had confidently expected a return to
power after the wartime coalition with Labour, but
their defeat at the polls was not only a rejection of
Churchill as the man to lead Britain in peace-time
and during a period of inevitable major
reconstruction, but also of their pre-war record as a
government. The overall Labour majority was 145
124

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seats, a huge margin, and a testimony to the fact
that voters, by and large, wanted a fresh start and
not a return to the policies that had caused so much
social misery in the 1930s. 
(2)