Marginal constituencies are the contests in the election that are expected to be closest, based on the 2017 result. They are the most important seats to target for tactical voting, and wider campaigning for the party that can stop the Tories there.
|Constituency||Likely contest (2019)||Tactical vote||Margin (2017)||Distance|
|North Devon||Con. vs Lib Dem||Lib Dem||7.78%||39 miles|
|Vale Of Glamorgan||Con. vs Labour||Labour||4.08%||41 miles|
|Cardiff North||Labour vs Con.||Labour||8.02%||48 miles|