THE workhorse of CalMac's Arran ferry route is in Greenock for her annual overhaul.

MV Caledonian Isles is currently at Dales Marine's base in James Watt Dock for essential maintenance.

She is due to be at the yard for a few weeks and expected to resume service around January 24.

The Ardrossan-Brodick crossing is meanwhile being covered by MV Isle of Arran and catamaran MV Alfred, which has been chartered by CalMac.