In reply to captain paranoia:
I seem to suffer from poor circulation in my hands (or I just complain a lot more than my partners!). My hands often go very pale if I don't manage them well and that leads to screaming hot aches, typically during seconding a pitch. I hope some of the following is useful as it's worked so well for me, although I don't have Raynaud's.
I'm careful to wear the right gloves at the right time. I'll wear some thinnies for the (sweaty) walk in and always put on a belay jacket when I stop moving. I switch to thicker gloves when gearing up or approaching up (damp) snow slopes at the start. I always try to use a fresh pair of gloves when the real climbing starts.
I find hand warmers in the palm of my gloves make all the difference and don't get in the way of climbing at all. Even if I don't feel that cold I'll put them in when gearing up to prevent getting cold later.
I'm also disciplined at belays, always putting on a belay jacket even if I'm feeling warm after a pitch. After belaying my partner I know I'll be colder and why waste heat? I swap to thick belay gloves so I'm not handling cold, wet ropes in my climbing gloves. I find switching back to climbing gloves is fine if I have them down my top and have hand warmers.
As for feet, my toes have suffered ever since some mild frostbite, but a good pair of boots have sorted that out. In particular you want a boot that does not allow snow to collect on the laces and melt into the leather. Spantiks for me, even in Scotland. Yes I look like I have all the gear and no idea, but when have warm feet ever been a problem?