One transport expert tells the BBC it might be better to run the new CalMac ferry on diesel.

The CalMac ferry will begin timetabled sailings after a long-running political row over its construction.

The story of a shipbuilding contract that went badly wrong and became a huge political controversy.

The long-delayed ferry is now expected to enter service on CalMac's Arran route in January.

Transport Minister Fiona Hyslop says she is pushing ferry operator CalMac to consider "all options" to maintain services.

CalMac said new problems had been uncovered on MV Caledonian Isles while the ship was in dry dock.

Trials of the Isle of Man ship Ben-My-Chree found it could not berth safely on the Arran route.

The MV Caledonian Isles has not been in service since leaving its route for an overhaul in January.