They advertise every year on the tube... I think about this time of year you also start to see Christian ads - can't remember who exactly but there's always a drawing of a guy on a motorbike... anyway, yes, they sound as if they have a bias towards one particular philosopy. That doesn't mean they don't teach others properly, of course, but possibly not entirely objective.
Yes, the Scientologists used to have premises on Tottenham Ct Rd and assailed passers-by. I think they fled about the time China moved in. I expect her great mental powers overcame all the engrams.
http://www.scientology-lies.com/