Snowheads forum has a few usual recommendations; including Col. He was swanning around Europe with the Scottish team when I needed a fitting a couple of months ago, so he pointed me to James at Outdoor Traders in Abingdon.
Very nice and friendly guy who went out of his way to help me. It was a toss up between a Dale Boot or a Salomon, and due to the amount of time I had before I travelled I went for the Salomon. He gave me his own dale boot liner in the salomon to tide me over for a week of skiing, and I need to go back for my own liner. He's charged me once but it's effectively 2 fittings – so he's down by about 3 hours labour. All "part of the service".
I had a few aches but what a difference I found a custom boot , liner and footbed made. I was really worried about how the plates in my leg would rub but the boots were very comfortable. My new boots are 26.0 – my old boots were 27.5! A proper liner in a close fitting shell make a huge difference – and I didn't have to clamp my boots down really tight to get some control. Thoroughly recommended…bear in mind you're looking at about 600 for boots liners and footbeds though (more or less depending on the shell) you choose.
Your biggest problem will be whether any of the fitters have shells in your boot size. Col was out of stock in my size IIRC, James still had quite a lot – but for that amount of cash you may as well go for the dale boot and a full custom fit.
Profeet in London were on my list of possibles but I'm pleased I made the effort to go to a proper "master bootfitter".
