Hi Tgar, a few of us hired a boat at "Calis Boats" on a private basis a few years ago for a trip to the Sunset restaurant for lunch. If memory serves I think it cost about £30 return, but as I say there were a good few of us so only a couple of pounds each. The chap just gave me his card and said ring when you are ready and sent one of the boats over for us.
PS One of the best afternoons ever!