We seem to have got about as far as we're going to with this discussion.
It has been established that LeewayComposite's "new" design is not all his own work. Whether it's a straight copy, or some kind of hybrid copy, it meets my definition of a "splash":
"using an existing hull, or part of an existing hull, to produce the mould for a boat without permission from the owner of the design rights"
So Jon Fuller gets his £10
I've deleted a few petty insults, and other irrelevant posts, and closed the thread. If anyone really has anything to add then please PM me and I'll be happy to help.