Frequently Asked Questions — Arfon Constituency

Who won the Arfon constituency election in 2015?

Plaid Cymru held Arfon constituency at the 7 May 2015 General Election. Plaid Cymru won with a majority of 3,668 votes (13.7%). Turnout was 66.3%.

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 Arfon in 2015 is shown in the statistics above.