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MV Isle of Mull was designed for the route between Oban and Craignure on the Isle of Mull. After being launched on the Clyde in 1987, she entered service on the 11 April 1988, in place of the older and slower MV Caledonia.

However the new vessel was seriously overweight – by more than 100 tons - due to both design and Steel Supply, British Steel had installed a new Computerised Gauge Control at its Dalzell Plate production unit, and during the initial production of steel plate after its introduction it tended to produce plates still within the allowed manufacturing specification, but at or near the upper gauge allowed in the tolerance - resulting in the steel tending to be heavier than designed. In late autumn 1988 she was taken out of service for two weeks and sent to Tees Dockyard Ltd in Middlesbrough to be lengthened by 5.4 m (20 ft). The extent of this implant can most easily be observed when climbing the stairs from the car deck to the passenger accommodation. These stairs used to be a single flight, but now have a level section halfway up. The new length of hull made the vessel better both in terms of vehicle capacity (taking it to around 80) but also in that she handled better at sea with her overall speed increased slightly.