Frequently Asked Questions — Carshalton and Wallington Constituency

Who won the Carshalton and Wallington constituency election in 2015?

Liberal Democrats gained Carshalton and Wallington constituency at the 7 May 2015 General Election, taking the seat from Conservative. Liberal Democrats won with a majority of 1,510 votes (3.2%). Turnout was 68.0%.

What was the swing in Carshalton and Wallington at the 2015 election?

The swing in Carshalton and Wallington was 2.2% from CON to LD — a modest shift towards LD. 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 Carshalton and Wallington in 2015 is shown in the statistics above.