By Elisabeth O'Leary
EDINBURGH (Reuters) - Scottish leader Nicola Sturgeon said on Sunday there was a "golden opportunity" to argue for Britain to remain in the European single market after Brexit, as no-one had yet demonstrated the benefit of loosening trade ties with the EU.
Before publishing a study of the economic impact of Brexit on Scotland on Monday, Sturgeon, whose nationalist SNP runs the devolved Scottish government, said there was no alternative to EU membership that could deliver the same economic benefits.
"There is zero credible evidence to suggest leaving the Single Market will bring any benefit to our economy.
Indeed, as our analysis will show - the harder the Brexit, the worse will be the outcome," Sturgeon said.
May is preparing for the start of talks about Britain's trade relationship with the EU once it is no longer a member.
Agreeing a united stance has been made harder by infighting in May's cabinet and Conservative Party over their vision for the new relationship with the EU, while the biggest opposition party, Labour, is also split on the best way forward.
Speaking to the BBC's Andrew Marr, Sturgeon again urged for Labour to sign up for Britain to remain in the single market, but leader Jeremy Corbyn said membership of the market was dependent on being a member of the EU.
"So I don't quite understand why she would keep saying join the single market when leaving the EU means you leave the single market," Corbyn told the ITV's Peston on Sunday programme.
"You have to make a special relationship with the EU," he said, adding that there were "aspects of the single market" he would want to challenge such as state aid rules.
May has said she is targeting the closest possible economic ties with the EU after Brexit to reduce future problems for companies, but also wants to reduce immigration and restore sovereignty by ending the jurisdiction of the European court.
The British government has also said it is seeking a one-size-fits-all Brexit that would suit all parts of the UK, ruling out the possibility of a second referendum on independence, a vote Sturgeon said she would be able to have a view on by the end of the year.
"(Those defending Brexit) have completely failed to explain how their approach could even remotely come close to replacing the enormous lost trade and investment," Sturgeon said.
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