Labour voters urged to back Lib Dems in 17 key seats in tactical voting campaign

Exclusive: A further 43 seats where Lib Dem supporters should back Labour have also been identified

Labour supporters have been urged to vote for the Liberal Democrats in 17 key Tory seats at the next general election as part of an ambitious tactical voting campaign.

The centre-left think tank Compass has also identified 43 marginals where Lib Dem backers may consider switching to Keir Stamer’s party as the best way of ousting Conservatives.

The organisation has drawn up a list of 62 constituencies described as “progressive tragedies” because a Tory candidate triumphed – despite the combined progressive vote being higher than votes for right-wing parties.