ベルパー (議会選挙区)
To compensate for this loss of electors, the changes transferred in the rest of the Repton Rural District from the West Derbyshire and South East Derbyshire constituencies. In addition from South East Derbyshire came the Urban District of Swadlincote.
In 1974 the boundaries were realigned with those for local government which had changed to transfer some electors to Derby. In 1983 the constituency was broken up, although the largest part (40,000 voters around Swadlincote) formed the basis of South Derbyshire. 22,000 voters around Belper itself went to West Derbyshire, and 10,000 voters to Amber Valley.