General Election: Top target seats, by party

Here is a list of the top target seats for the main political parties at the General Election on July 4.

The election is being held using new constituency boundaries, which means the results cannot be compared directly with what happened at the last general election in 2019.

To measure how well the parties do at the election, and to determine which seats they need to win to form a government, a set of notional results for the 2019 election has been calculated to show what would have happened if that contest had taken place using the new boundaries.

These notional results have been compiled by Professor Colin Rallings and Professor Michael Thrasher of the University of Plymouth, on behalf of the PA news agency, the BBC, ITN and Sky News.

The lists of target seats are based on the size of the swing in the share of the vote needed to gain the seat, calculated using the notional outcome in 2019.

The top 150 targets have been listed for , the top 100 for the Liberal Democrats, the top 50 for the and the top, as they can only make a maximum of nine gains).