Taxi Hire on Bute
For a small island, there's a number of excellent local taxi operators, the majority of whom are based in Rothesay.
If you are arriving on the main Wemyss Bay - Rothesay ferry, there's no need to pre-book a taxi as there is a rank just outside the ferry terminal building, across the marina footbridge. The taxi drivers know the ferry schedules and there's rarely an issue hopping straight into a cab.
One operator has an 8 seat minivan for hire - this is probably best booked in advance.