Nicola Sturgeon will give a “detailed and substantive statement setting out a path forward for Scotland” when she updates Holyrood on her plans for independence.

The First Minister’s official spokesman said she would aim to “strike an inclusive tone” when she gives a half-hour statement and fields questions from MSPs tomorrow afternoon.

He said: “The First Minister will give a detailed and substantive statement setting out a path forward for Scotland amid the ongoing Brexit confusion at Westminster.

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“The First Minister will take time to set out her thoughts on that front and in doing so she will seek to strike an inclusive tone.

“There will be plenty of detail. It’s a 30 minute statement.

“The FM will explore some of the issues which have arisen because of the ongoing Brexit situation and Scotland’s constitutional future.”

There is speculation at Holyrood that Ms Sturgeon will again request the power to hold a referendum - a so-called Section 30 order - even though Theresa May has already refused to grant one.

Fearing an anti-climax, the Greens said it would be “hugely disappointing” if Ms Sturgeon failed to use the ‘triple-lock’ mandate she claims to have for another vote.

Ms Sturgeon discussed her plans with the Scottish cabinet this morning.

Her spokesman said there was "positive feedback" from ministers when she told them what was happening.

However he also said no documents or legislation would be published alongside the statement, suggesting it will be a rhetorical rather than a practical step towards Indyref2.

One SNP MSP said bluntly: “She said she wouldn’t do it without a Section 30 order and she’s not going to get one. So it’s not happening.”

Asked what the Prime Minister’s response would be to calls for a Section 30 order to pave the way for a second independence referendum, Ms Sturgeon's spokesman said: “You know the Prime Minister’s position on that and it has not changed.

“First and foremost, let’s wait and see what the First Minister says.”

Pamela Nash, chief executive of the anti-independence group Scotland in Union, said: "Nicola Sturgeon should use this opportunity to drop her reckless threat of a divisive and unwanted second independence referendum.

"We know the SNP only cares about creating more division, but the majority of people in Scotland want the government to get back to the day job and fix the crises in our schools and hospitals.

"It's time for the First Minister to end the damaging uncertainty and work to bring the country together."

Green MSP Patrick Harvie, who has repeatedly chivvied Ms Sturgeon about using her mandate to call Indyref2, criticised the lack of momentum to date.

He said: “The day after the Brexit vote the First Minister sounded like she was firing the starting gun on a referendum campaign but nearly three years on the race hasn’t started, despite Scotland having been subjected to utter contempt from Westminster all that time.

“There is a mandate to hold a second independence referendum within the current session of the Parliament and it would be hugely disappointing, as well as a dangerous precedent, to let that expire in the face of Tory obstructionism.

“Scotland needs an escape route from a Brexit it didn’t vote for and the Scottish Greens stand ready to campaign hard for an independent Scotland in the EU.”

Scottish Labour leader Richard Leonard said Ms Sturgeon had "no evidence" the people of Scotland wanted another independence referendum.

He said: "This debate is a distraction from the real and serious problems Scotland faces - a low pay economy, exhausted public services and 1 in 4 children living in poverty.

“The mess of Brexit throws into sharp relief the challenges of leaving a political and economic union. The answer to challenges of the UK leaving the EU is not and never will be Scotland leaving the UK.

“Leaving the UK would lead to unprecedented austerity for Scotland’s public services. Each currency option the First Minister has tried simply makes that worse."

Scottish LibDem leader Willie Rennie added: "The First Minister should take the opportunity to tell parliament that she is ruling out another independence referendum. 

"She must tell parliament that she has learnt the lesson of Brexit, that breaking up long-term economic partnerships is damaging and divisive and that she does not want to inflict that on Scotland with independence.  

“The SNP’s relentless independence focus makes it look like they have their fingers in their ears.

"The First Minister should take independence off the table, show the country she’s learnt lessons from the chaos of the last two and a half years and put businesses’ minds at ease.”