Frequently Asked Questions — Don Valley Constituency

Who won the Don Valley constituency election in 2019?

Conservative gained Don Valley constituency at the 12 December 2019 General Election, taking the seat from Labour. Conservative won with a majority of 3,630 votes (8.0%). Turnout was 60.3%.

What was the swing in Don Valley at the 2019 election?

The swing in Don Valley was 9.6% from LAB to CON — a significant 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 Don Valley in 2019 is shown in the statistics above.