To be honest I would not recommend Optimax Bristol. My experience has been less than enjoyable and the complications, pain, administrative problems and time spent off work mean that I wish I had stuck to glasses / lenses. Whilst the results have been pretty good (-3.5 and -3 astigmatism) down to nearly 20:20 - the journey, starting in September last year, has not been an enjoyable one. I could easily list 25+ problems (some ongoing) that I have suffered and I get the feeling that the place is falling to pieces with surgeons/staff leaving. I could go on for hours but don't wish to send everyone to sleep. For a place performing such important work you would expect more professionalism, better systems and higher quality staff.
In summary - don't bother, yes the results can be quite impressive but I wish I'd have stuck to a good pair of glasses. If you must - go elsewhere!