Frequently Asked Questions — Brentford and Isleworth Constituency

Who won the Brentford and Isleworth constituency election in 2010?

Conservative gained Brentford and Isleworth constituency at the 6 May 2010 General Election, taking the seat from Labour. Conservative won with a majority of 1,958 votes (3.6%). Turnout was 64.3%.

What was the swing in Brentford and Isleworth at the 2010 election?

The swing in Brentford and Isleworth was 10.8% from LAB to CON — a modest shift towards CON. 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 Brentford and Isleworth in 2010 is shown in the statistics above.