In reply to dunnyg:
I'd second the comment about the covent garden store (or in close proximity to), sales guy was happy to spend the best part of two hours helping us out with boots.
Price wise, they're a bit steep on the la sportiva nepal's, but I suspect that that might be down to la sportiva playing silly beggars with other stores to have their kit in more or less exclusively (I say that in a vague, that's what it looks like to me kind of way).
My feet, however, didn't like the nepal fit (they're a bit too narrow across the front), which means that the whole deep-discounting thing makes no odds to me. Long story short, I'll probably buy my boots from there- I'll suck up a 10% price difference just because the service was so good. And I've not got cash to burn, so that's a lot, coming from me!