Scottish Labour faces a historic defeat if it fails to stand up to a damaging Brexit, according to a poll of more than 2,000 voters in Scotland.

The YouGov poll, conducted for the People’s Vote campaign for a second referendum, found that support for the party would fall 6 percentage points to 15 per cent if a deal passed with the support of Conservative and Labour MPs. A quarter of voters who supported it in the general election would choose the SNP instead.

Without Labour voting with the Tories, the poll, conducted between December 21 and January 4, put the SNP on 40 per cent, Conservatives on 25 per cent, Labour on 21 per cent and the Liberal Democrats on 8 per cent.

Although Labour