Frequently Asked Questions — Portsmouth South Constituency

Who won the Portsmouth South constituency election in 2019?

Labour held Portsmouth South constituency at the 12 December 2019 General Election. Labour won with a majority of 5,363 votes (11.3%). Turnout was 63.9%.

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 Portsmouth South in 2019 is shown in the statistics above.