In reply to djmarko75: Well, Gillercombe wasn't in when I was up in the really cold spell in Jan, though it may have been in for a day or 3 later that week? You need a heavy snowfall in Dec or Jan followed by a week of cold and some top up snowfalls, if you then go on a cloudy day it may be in nicely.
I can recommend a winter line based on Grey Knotts face though, excellent climbing under snowy and frozen conditions and somewhere around grade IV