John Swinney is beneath mounting stress to elucidate his position within the Cal Mac ferry fiasco that has price taxpayers tens of millions of kilos.
The Deputy First Minister was revealed yesterday to have given final approval in 2015 to the disastrous deal to construct two new ferries on the Ferguson Marine shipyard.
Neither vessel has been completed virtually seven years later and the enterprise needed to be nationalised in 2019 after large price overruns on the undertaking compelled the yard into administration.
A key doc - beforehand thought misplaced - was lastly revealed yesterday which confirmed that then transport minister Derek Mackay signed the contract with Fergusons in August 2015.
However civil service recommendation in an electronic mail chain revealed the deal was solely given the go-ahead after Swinney may very well be personally briefed on the matter.
Douglas Ross immediately demanded the senior SNP minister make an announcement to parliament on the affair.

Talking at First Minister's Questions, the Tory chief revealed that unredacted paperwork confirmed the Scottish Authorities was warned of "vital procurement dangers" when the Ferguson deal was signed off.
He mentioned: "They waited for the Deputy First Minister to present the inexperienced gentle - trustworthy John's arms are throughout this dodgy deal".
Ross requested Nicola Sturgeon how she might blame Mackay when it was Swinney who signed off the deal.
The SNP chief hit again: "It appears fairly apparent to anybody who's wanting - the Deputy First Minister didn't take the choice.

"He wasn't even copied in to the recommendation that was the idea of that call.
"He was merely briefed on the choice after it was taken - not even at his request however on the initiative of an official.
"It isn't uncommon for finance secretaries to be briefed on the spending of cash.
"It doesn't imply the finance secretary has really taken the choice."
Ross insisted it was "very clear" that officers escalated the choice to the Deputy First Minister.
He continued: "That is the most recent incompetence from this SNP Authorities.
"They revealed a sequence of responses which have been closely redacted - strains blacked out.
"Besides they did such a poor at redacting the paperwork, in case you copy and paste them into Microsoft Phrase, the knowledge is revealed.
"In a single part of the redacted doc, it warned of a danger of authorized problem to the contract."
The Tory MSP added: "In different phrases, going forward with this contract was such a foul concept it might open up the federal government to much more losses than they'd already skilled."
Chatting with reporters after FMQs, Swinney mentioned: "As finance secretary on the time, I’m chargeable for offering the funds for the assembly of any contracts.
"What officers have been doing was briefing me that there was no want to vary the funds preparations primarily based on the contract that had been agreed and permitted by the transport portfolio, and which in fact is confirmed by the e-mail path you bought yesterday."
Requested if he gave it the nod, the Deputy First Minister mentioned: “What I gave was the funds approval, which I had given in August.
"And the funds approval I gave in August of 2015, the officers assured me on October 9 didn't should be modified.
"The finance secretary doesn't approve all contracts, if that was the case there can be vital inefficiency within the processing of contracts inside Authorities."
Responding to a different query, he mentioned: "I didn’t give it the ultimate nod.
"I used to be given assurance that the funds provision that I had put in place in August was ample for the contractual preparations."
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