ベルパー (議会選挙区)
The area had an ever-expanding population after 1945 as prosperous suburbs of Derby were built outside the city boundaries. Lord George-Brown, who represented the seat at the time, wrote in 1971 after his defeat in the 1970 general election that "The electorate had increased by over 10,000 since 1966, mainly from the growth of middle-class housing estates, so that most of the new electors could be expected to vote Tory. Since my majority in 1966 was 4,274, an influx of 10,000 new voters, mainly Tory, obviously imperilled the seat."