Inspired by you, I've checked their website out. £165 for the senior stylist sounds v. OK to me. In fact, I think you should check out if that is just a baseline, or if it goes up with length of hair/difficulty of job. And then post back here!
Isn't that quite close to CW anyway? I'm sure last time I went to CW (about 4 years ago, 5?, 6?) it was in the region of £130 [hazy recall].
I really want you to go!!!! And tell us if it's any good!!!
Seriously, he's so famous, I can't imagine he'd dare have anyone other than extremely good cutters and colourists because he must just know that a photo of woebegone damsel outside his salon, with a fright on her head and the caption "Kate Moss' hairdresser did this to me" would make it into the press with some ease.
The salon also seems to be very small, not at all a chain, with a small team. (Anyone out there with more info?)
On the other hand, it sounds like you found yourself a good stylist at CW - hence her getting promoted.
For the record, £165 is less than I paid all those many, many years ago when I was young, childless and profligate!