Frequently Asked Questions — Derby South Constituency

Who won the Derby South constituency election in 2015?

Labour held Derby South constituency at the 7 May 2015 General Election. Labour won with a majority of 8,828 votes (21.6%). Turnout was 58.1%.

What does swing mean in UK elections?

Swing measures how much support has shifted between two parties compared to a previous election. The Butler swing formula — used in British election reporting since the 1950s — takes the average of the gain in the winner's vote share and the loss in the runner-up's. A 5% swing is considered large at ward level; anything above 10% is exceptional. The swing figure for Derby South in 2015 is shown in the statistics above.