Frequently Asked Questions — West Dunbartonshire Constituency

Who won the West Dunbartonshire constituency election in 2017?

Scottish National Party gained West Dunbartonshire constituency at the 8 June 2017 General Election, taking the seat from Labour. Scottish National Party won with a majority of 2,288 votes (5.2%). Turnout was 65.2%.

What was the swing in West Dunbartonshire at the 2017 election?

The swing in West Dunbartonshire was 10.2% from LAB to SNP — a modest shift towards SNP. 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 West Dunbartonshire in 2017 is shown in the statistics above.