In reply to Calum Nicoll:
I completely agree with you here.
I just dont understand the argument about damaging the rock when something is not in condition. (unless it needs a freeze to hold blocks together etc)
If it is covered in powder you don't scratch and tw@t your tools to get a placement, you have a look, give it a brush with your glove if need be, place your tool once and pull.
If it's well rimed and the cracks are choked with ice, its a battle to scratch and clean placements with your tools to get something your happy with. Thats where the scrathes coming from.
Same with your feet, if you see a dry ledge or nubin to stand on your not going to scratch and slip looking for something better.
The only reasons that the route has to be in winter nick is to provide the challange IMHO. You can't get the full tick if your tooling up dry rock - simples...