MV Caledonian Isles, usually referred to locally as the Cally Isles, is one of the largest ships operated by Caledonian MacBrayne (CalMac), which runs ferries to the Hebridean and Clyde Islands of Scotland. Caledonian Isles serves the Isle of Arran on the Ardrossan to Brodick route. As it is one of CalMac's busiest routes, Caledonian Isles has the largest passenger capacity in the fleet, and can carry up to 1000 passengers and 110 cars, with a crossing time of 55 minutes. She is used extensively

Cameron McNeish undertakes a 150-mile journey through some of the least visited parts of our country from the southern end of Sutherland to the northern tip of the Orkney islands. Tuesday 27 and Wednesday 28 December, 6pm, BBC Two Scotland | BBC Scotland