Ta, for the reply's, the only thing that worries me is that if I am a size 9, and I know a size 9 is just right, I can check in the shop with a sock or 2 and it will be perfect.
The problem arises when you have spent 9-10 hours climbing what do your feet end up swelling to? 10-11? there is just no way you can test this out before buying boots....