I booked and payed days in advance, but unfortunately they called me 2 days before my appointment telling me they couldn't perform my treatment (they were closing the centre on that day). The girl whom I spoke to was actually very kind, and transfered my appointment to another Leisure Centre (Bethnal Green).
Unfortunately my experience there wasn't as I expected it. In my opinion 1 hour for a brasilian waxing is way too much, and although the girl was very kind she hurt me 2 or 3 times while taking off the wax.