South West Norfolk has been held solidly by Conservatives since 1964 but for twenty years before then, it had been ultra-marginal: Labour first held it from 1929–31, and Sidney Dye won it for Labour in 1945 with a tiny majority of 53, holding it at the 1950 election by 260. He lost it to Denys Bullard in 1951 by 442 votes and won it back in 1955 with a majority of 193. Dye died at the end of 1958, and in the by-election Albert Hilton retained the seat for Labour by a margin of 1,354 votes. In the 1959 general election that soon followed, his majority was cut to 78.