In reply to higherclimbingwales:
Thanks guys. I did ask for whoever knew the most about boots, he came across as knowledgable and had done lots of Scottish winter but not MB. The boots feel great, really comfy and good ankle support. We are going to climb Ben Nevis in March as a taster and I figure if they do well there in terms of fit, warmth and getting on with my old G12 crampons then they should work? I would love to do more high altitude stuff, but with other commitments trips like this don't happen very often. If BN is a disaster and I moan enough to my other half I may get away with a B3 purchase, but as you know this stuff really adds up and I need new trousers too!