Balaclava is definatly a must - I always carry one in my lid. I've been using a warmback furry for 3 years now. Bear in mind - that I'm as nesh as a nesh thing (
) so the warmer the better for me. Ive started wearing a helly themal layer under it if I think it will be cold or a neo/fleece for wet stuff.
The problem with two piece stuff is tops tend to ruck up round your chest if your crawling a lot - not helpful :x . And I find my furry is too baggy to be of real insulating value.
Modern climbing thermals (powerstreach/capaline) would be far warmer and less cumbersome albeit more expensive.
Anyone out there splashed out for the Petzl undersuit. I think they are made of powerstretch - I reckon they could be the buisness. If you want to be warm that is .
Doesn't help you much though Huw. How about trying just a thin thermal top and leggins.