Labour Remainers say they would be more likely to vote Liberal Democrat than stay with Jeremy Corbyn Pedro Rocha/AP

Labour would fall behind the Liberal Democrats in the polls if Jeremy Corbyn helps the Tories to secure Brexit, according to a huge new poll.

The YouGov survey of 5,000 voters, commissioned by the People’s Vote campaign, shows that support for Labour could fall from 36% to 22% if they helped the Tories to pass a compromise deal with Brussels like the one advocated by Theresa May.

Under those circumstances, the Lib Dems would soar from 10% to 26% — their highest rating in any poll since they entered coalition government with the Tories in 2010.

The poll shows that Labour’s supporters want a People’s Vote by a margin of almost three to one — and an even bigger proportion would stay in the European Union…