Thanks for the advice guys.
Thought about a compressed neoprene suit, but i like the idea of being able to alter the thickness of undersuit to suit conditions and the extra flexibility of a membrane suit that iv heard about.
And more importantly...
spoke to my LDS and theyve offered to do a deal on a drysuit/undersuit package, possibly offering the undersuit for no extra cost on top of the drysuit
Hopefully theyll stock Weezle suits, will have to ask though, all theyve mentioned so far are the Gates and N Diver.