Ferry operator CalMac has announced a major reshuffle of its boats this summer amid warnings of “constraint” on the Isle of Arran route popular with tourists. Caledonian MacBrayne has said services are currently “stretched to the limit”, but warned of further disruption when repairs are carried out on one of the larger ferries, while two new vessels are now six years late and triple the original predicted cost. The return of MV Caledonian Isles – a 31-year-old ferry which operates on the Ardross