In the inter-war period the Tories and their assorted ex-Liberal allies had never won more than 44% of the Cornish vote. In the four elections in the 1950s they never won less. The Liberal decline reached bottom in 1951, although the party recovered to retake second place from Labour in 1959. Labour’s vote meanwhile, at 28-30%, was at its historic peak in this period.
Here are the detailed results by constituency.
Cornish studies resources 