Since then the ferry has been anchored at King George V dock on the Clyde, awaiting transfer to Denmark to be scrapped.
That was first mooted for April, but according to The Scotsman the ship has been unable to enter the European Union due to regulations over hazardous waste.
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The issue is believed to be related to the freezer compartments on board, and in particular the insulation used in their construction.
A Cmal spokesperson said: “Decommissioning a ferry is a complex task, which requires input from a range of specialists.
“From salvaging engine parts to removing hazardous material, the project has been closely managed to ensure compliance with all partners, such as the Scottish Environment Protection Agency and the Danish equivalent.
“We are in the final stages of completing the required paperwork and hope to see her start the journey to Denmark as soon as all necessary permissions are granted.
“The rules have changed since Brexit and it takes more time to obtain approvals on paperwork. When paired with the complexity of decommissioning work to retain important parts of the vessel, the project has taken slightly longer than originally planned.”