In reply to Brian Pollock:
>
> Also, is it madness to carry an expensive DSLR in your bag while Scottish winter climbing?
>
Nope, not at all.
I took a D3000 up there a few seasons ago when we did various routes. Just get a drybag to put it in and strap it safely to the outside of the bag or you may find condensation being a bit of an issue.