I booked a full body massage (50 mins) and taster Elemis facial (20 mins). The staff were friendly and professional and explained everything they were doing. The spa is lovely, beautifully clean and a very relaxing experience. It is worth turning up 5 - 10 mins early to complete the paperwork if you've not been before. Worth noting that the facial includes a head massage with oil - didn't bother me as I wasn't at work after but you could ask them to miss this step if you need to head back to the office afterwards.
Taking 5 friends with me next time (already booked!) ... I had a 15 minute treat not hydrotherapy but you get a great choice and I felt amazing afterwards :))