Frequently Asked Questions — Ynys Môn Constituency

Who won the Ynys Môn constituency election in 2019?

Conservative gained Ynys Môn constituency at the 12 December 2019 General Election, taking the seat from Labour. Conservative won with a majority of 1,968 votes (5.4%). Turnout was 70.4%.

What was the swing in Ynys Môn at the 2019 election?

The swing in Ynys Môn was 9.7% 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 Ynys Môn in 2019 is shown in the statistics above.