The therapists at Serenity are excellent, and I have always had good treatments there. My husband also had a deep tissue massage which he said was really great.
The only slight negative is that the waiting area isn't exactly relaxing. Perhaps a couple of seats would be better than the high and narrow bench that offers the only seating at the moment. But that really is a minor point, and for a high street spa, Serenity really is very good indeed.
Good value with the off peak discount. The masseuse called back after booking online because she could not do the time I booked online - this was inconvenient but it seemed a system issue rather than disorganisation etc.