Hmmmmh did you try InvincibleRubber in London.. they have pretty neat fullbody suits, neck entry, you can try them on in the store which is the start of adventure, and then directly keep them on when you but them :D
Good luck!
Libidex have a sale with up to 40% off their made to measure stuff, or go to their beta site Latex Express where there's 30% off their ready to wear range.