LABOUR and the Conservatives will be wiped out in Scotland at a general election if they do not back a public vote on any Brexit deal, according to new polling analysis.

The SNP would win all but the Lib Dems’ four seats in Scotland, with Scottish Labour forecast to haemorrhage 40% of their 2017 votes.

Analysis of polling for Best for Britain and Hope Not Hate found that Labour would lose three votes to Remain-supporting parties for each one vote it would lose to the Brexit Party.

Scottish Labour is due to decide whether to commit to backing a second referendum in all circumstances, as supported by leader Richard Leonard.

Ruth Davidson’s Tories, meanwhile, are committed to supporting Brexit.

A decision on the Labour policy will be made by the party’s Scottish Executive Committee at a meeting in Glasgow on Saturday, with sources close to Leonard suggesting he is confident members will back a confirmatory vote with an option to remain.

The study of voting intentions from 15,231 survey respondents in the UK found only 57% of people who voted Labour in 2017 said they would do so again in a new election.

Best for Britain chief operating officer Naomi Smith said: “The consequences of Labour’s ambivalent policy towards a final say on Brexit looks set to hurt them further. They’re expected to lose almost half of their 2017 vote share, according to our analysis.

“The Labour leadership now needs to pick a side, and that can start with the Scottish Labour executive committee voting to become a party of remain. It’s obvious which position Labour should take ... and Richard Leonard can demonstrate leadership on this for the entire UK party.”