In reply to Jack_Lewin:
Thanks for the fitter recommendation.
Actually I don't think this was luck - quite the opposite. My point is that boot fitter let me down in the past. There's nothing like hiring different boots to get a feel for which ones are best for you. Skiing a week in them is the best advice....
As for size, they're perfect. But again I got to change as many times as I wanted so found the right size for me by using them rather than asking some guy in a shop. And I saved over a hundred pounds on the boots.