In reply to 1philjones1: I did some research on the WSW ridge a few months ago, as you state its about AD in summer and the rock climbing is allegedly up to HS with a few bits of avoidable VS. Couldn't find any equivalent winter grades but if the route follows the same path in winter as it does in summer then it could potentially involve some quite hard mixed stuff by the sounds of things.
Hope this helps, I'll be interested to see if you get any replies from people with first-hand experience!
Matt