I've not calculated the costs properly or anything, but from what I can gather, for the cost you might as well go to the states where you're far more likely to get a good result.
Dai Davies is around £5,200. Dr Garramone is $5,700 (£3,937).
Personal opinion here, but I would never have surgery in the UK. I think the surgeons here are quite poor. There's been a fair few good results from Davies, but plenty of bad ones too. I just don't think that UK surgeons are even close to the standard of the US.
Dr Garramone is the best for DI and Dr Fischer is the best for peri. Again, just my opinion.
EDIT: As for other UK surgeons, there's Lena Andersson and Victoria Rose.