Update Well,after considering my first options and everyone else's suggestions,true to form i ignored all of them and went for something completely different !
I bought a Pinnacle Arctic,which is 7mm with some 5mm panels(under arms,behind knees) to aid with flexibility,i worked on the fact that i'm never too warm underwater.Still a one piece,and it fits me like a glove,i must confess.......i look like sex on legs when wearing it !!!!
It has a more conventional wetsuit zip,but has a "batwing" inner neoprene lining,so water does not flush through and good wrist and ankle seals.It is a touch more difficult to get on and off because of it,but not much. I also managed to pick it(and the matching boots) up at a lot less than retail ! Just need to get it in the Med now.
Oh,and one more thing.......it has Merino wool lining.......mmmmm........Flossy !!
Alan |