SCOTTISH Labour was last night accused of “raising the white flag” on Brexit as the SNP and Greens hit back furiously after the party’s sole MP claimed there was no mandate for a second independence referendum.

Ian Murray’s intervention came on the first day of his party’s conference in Perth during a debate on Kezia Dugdale’s plans for a federal constitution in the UK.

He told delegates Labour would oppose another independence ballot and would not share a platform with the Tories as it had done during the 2014 campaign.

“I want to make it absolutely clear to both Nicola Sturgeon, and indeed to Ruth Davidson, the SNP has absolutely no mandate for another Scottish independence referendum,” Murray told a half filled auditorium.

“If they try to push one through, Scottish Labour will oppose it in the Scottish Parliament all the way.’’ Linda Fabiani, the SNP MSP, responded saying her party won the Holyrood elections in May, on a manifesto pledge that the Scottish Parliament had the right to call a referendum if “Scotland faced being dragged out of the EU against its will."

“Labour’s conference anthem should be ‘we’ll keep the white flag flying here’ – their stance is a shameful capitulation to the Tories on Brexit,” she said.

“Just last year, the SNP won an unprecedented third term in government on a manifesto that specifically said the Scottish Parliament should have the right to hold a referendum if Scotland was taken out of the EU against our will.”

A spokesperson for the Scottish Greens added: “Two parties stood on manifestos which acknowledged the possibility of a referendum and Brexit has changed everything in any case.

“Given Labour have voted through the Tories’ hard Brexit rather than oppose it, if they block Scotland’s right to choose a different route they will only shuffle further down the path of irrelevance.”

Scottish Labour members backed Dugdale’s federalism plans, voting in favour of a motion calling on the UK party to convene “People’s Constitutional Convention’”, made up of citizens from across Britain, which would then report back before the 2020 General Election.

The convention is part of Dugdale’s federal approach to the constitution which would see increased powers for Holyrood, Cardiff Bay, Stormont and the English regions.

The Scottish leader’s proposals came in response to both Brexit and calls for a second independence referendum, and seek to establish a separate position from both the SNP and the Greens, and the Conservatives.

Murray said the Conservatives were to blame for the prospect of another vote dominating the political agenda, branding the party as “the SNP enablers”.

“It is they who are really responsible for this current mess – Nicola Sturgeon’s mibbes aye, mibbes naw referendum,’’ he said.

“Thanks to them, the constitution has barely been off the agenda since the early hours of September 19.’’ The MP insisted Dugdale’s vision offered a chance to “seize the mantle as the party of federalism’’.

He added: “The vision before you today is one of hope and optimism. It will mean that every part of the UK and every part of Scotland is contributing to our success.

"It will reforge our democracy and our society, and safeguard it for the future."

Scottish Labour deputy leader Alex Rowley said: “We say we will neither support the separatist solution of the SNP nor will we support the status quo of the Tories. We will neither cut ourselves off from our neighbours down south under the SNP, nor will we embrace the austerity economics of the Tories. We should be clear, and this conference should be clear to its leadership and to the Scottish executive, never will we stand on any platforms with a Tory party which inflicted such misery on the people of Scotland.’’ There was broad support at the conference for Dugdale’s vision but there was caution over her call for a ‘’new Act of Union."

Pauline Brown, an activist from Glasgow Kelvin, said: "We don’t want a union of the crowns, we want a union of the people.”

Scottish Conservative leader Ruth Davidson said: “On the day Labour is licking its wounds over its humiliation in the Copeland by-election, the Scottish party decides the way to reconnect with the real lives of ordinary families is a sleep-inducing plan for people’s constitutional convention and yet more upheaval to our precious union.

“This is a party that doesn’t know when to stop digging. Never has Scottish Labour looked more out of touch or irrelevant.’’