Frequently Asked Questions — Colne Valley Constituency

Who won the Colne Valley constituency election in 2017?

Labour gained Colne Valley constituency at the 8 June 2017 General Election, taking the seat from Conservative. Labour won with a majority of 915 votes (1.5%). Turnout was 71.6%.

What was the swing in Colne Valley at the 2017 election?

The swing in Colne Valley was 5.0% from CON to LAB — a significant shift towards LAB. Swing is calculated using the Butler two-party formula: the average of the change in winner's vote share and the fall in the runner-up's vote share compared to the previous election here.

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 Colne Valley in 2017 is shown in the statistics above.