Nice one Neil, I'd recognise that transom anywhere, as a kid in the turn of the 80's SLLaL was the boat I drooled over, although I only saw it in the flesh a couple of times, in those days boat porn was delivered in the form of a poorly photocopied Cherub Newsletter through a thing called "the post".
I am fairly sure I saw it once rotting around 1981 in a boat park at Ardleigh, near Colchester - however I may have dreamt that, not certain.
It just had beautiful lines for the time, and was clearly fast, Bill's build quality was also enviable, just look at that cross grained sapele !