Well said, Graeme, you know you can be very sensible when you want to be, and I have awarded you a greenie in recognition of the fact.
Boatster, you may be interested to know that one of Ribnet's more intrepid members, one David Manning, once crossed the Irish Sea, a distance of some 70 miles and not known for its calm waters, in a 4m Avon Searider. Vicious rumours circulated that he'd attached his bow line to the stern of the Irish Ferries fast catamaran, but these were later proved unfounded. 4m RIBs also completed a circumnavigation of the British Isles a couple of years ago, all of which does show what can be achieved in small RIBs. As MeMe says, you just have to slow down a bit more than the bigger boys.
Phil (I've got a small one, too) Davies