Your google-fu is weak...@Louch I just heard something third hand this morning about a "Great Arran cycle run" being held the same day as you are all going. 50 riders plus motorbike escort etc.. Just thought I should give you a heads up in case CalMac are restricting bikes on the ferry that day. Unlikely, but maybe worth checking. I googled but can find nothing about it.
http://www.stvincentshospice.co.uk/news/story.php?newssectionID=2&newsID=295