The Conservatives face an electoral wipe out in Scotland for the second time in 25 years as polls show voters turning their backs on the party.
The Tories lost all of their Scottish MPs at the 1997 general election - and the unpopularity of Liz Truss among Scots suggests such a result could happen again.
A survey of Westminster voting intentions by Savanta ComRes found Labour on 30 per cent - an increase of five points since June - while the Conservatives are on 15 per cent, down three points.
The SNP is unchanged on 46 per cent - suggesting Tory voters in Scotland are switching to Labour rather than from Nicola Sturgeon's party.
A separate poll by YouGov found support for the Scottish Conservatives is polling at its lowest level in eight years.
If repeated at a general election, the SNP could win 49 seats in Scotland, Labour seven, the Lib Dems three, and zero for the Tories.
Chris Hopkins, a research director at Savanta ComRes, said: "The difference between Scottish Labour and the Scottish Conservatives, particularly in the Westminster voting intention, will be particularly striking, with the former opening up a 15 point gap and fully establishing themselves as Scotland's second party.
"Given the unpopularity of the Conservatives across the rest of the UK at the moment, it's no surprise the story is similar in Scotland.
"However, the SNP remaining strong on 46 per cent is notable. I would not have been surprised to see Labour potentially eat into that SNP vote share, even marginally, and the fact that they did not all-but confirms that the Labour party are fishing in the unionist vote pool rather than a specifically centre-left one in Scotland."
Jackie Baillie, Scottish Labour deputy leader, said: "These polls clearly show that the people of Scotland want change and that change is coming - Labour is that change.
"People across the UK are being failed by this incompetent and immoral government but there is a majority for change.
"The next electoral test in Scotland will be a general election – not a referendum – and people have a choice between a Labour government that is on your side or a Tory Government that acts in the interests of the wealthy.
"At that election, Scots have a chance to boot the Tories out of Downing St."
Kirsten Oswald, SNP depute leader at Westminster, said: "The Tory economic crisis engulfing the UK demonstrates Scotland needs independence to escape Westminster control and get rid of the Tories for good.
"This poll shows voting SNP at the next election could wipe out every Tory MP in Scotland – and projects an increase in SNP seats and support for independence.
"The SNP is the main challenger to every Tory MP in Scotland – and with a snap election possible at any point the SNP is ready to fight the Tories and win."
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