THE former director of Ferguson Marine has called for a public inquiry into the ferry scandal which almost caused the demise of the shipyard.

In December Finance Secretary Derek Mackay warned two new ships being built at the shipyard, which was taken into public ownership last year, would cost double the initial cost and also take longer to build.

Discussing the deal today, Jim McColl said those involved should be "under oath" when discussing the matter in the public inquiry.

He added he feels "shafted" by the Scottish Government.

Mackay has said mismanagement by yard bosses was at the heart of the overspend and delays, but these claims have been rejected by McColl as "defamatory" and "nonsense".

He gave evidence to the Rural Economy and Connectivity Committee at Holyrood this morning. 

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Speaking to journalists outside, McColl said: "There's a huge amount to go into here.

"As I understand it, you can have a public inquiry, a parliamentary inquiry or a committee inquiry.

"This has been pushed to a committee inquiry. That's the lightest touch one.

"This needs a lot more investigation.

"The reason that I would like it to go to a public inquiry is I would like there to be a judge and I would like people to be under oath."

Asked if he believes some in the inquiry are not telling the truth, McColl replied: "I want them to be compelled to come and answer, rather than something less forceful."

During the hearing, McColl also accused First Minister Nicola Sturgeon of announcing the contract publicly before a price had been agreed.

Ferguson Marine shipyard was initially pushing for £105 million for the two ships, but McColl said Sturgeon had publicly stated the cost would be around £97m before final arrangements were put in place. 

McColl then alleged his firm was told by Caledonian Maritime Assets Limited (CMAL) - the buyer of the two vessels - there was no more room for negotiation because the contract had been announced.

When asked by Conservative MSP Jamie Greene about where the price for the ferries came from, McColl said: "We were at £105 million, in negotiations with CMAL and they were trying to get us to £97 million."

McColl also contended that Ferguson Marine was looking to buy equipment in euro, and had attempted to get the Scottish Government to cover any losses made due to money exchanges.

He added: "Before we agreed the negotiation the First Minister had announced that we had been selected as preferred bidders and the price was £97 million.

"CMAL then came back to us and said 'it's been announced by the First Minister, you'll just have to accept it'."

McColl also rubbished claims made by Tim Hair, who was appointed by the Scottish Government last year as the turnaround director for the yard.

Hair said in a report that internal processes "have generally been found to be poor or non-existent to control a project of this magnitude".

McColl said: "They are absolutely scandalous claims."

He went on to say the Scottish Government has not held a planning meeting for the ships in the last six months.

He added: "(The report) is grossly misleading."