The Theosophical Society also lets its lodge be used by a variety of other organisations, including the Bristol Dowsers; a branch of Carlos Castaneda's Tensegrity folk (some of the videos of Tensegrity are quite something); a meditation group; and the local branch of the White Eagle Lodge, founded by a medium who received various teachings from the eponymous founder.
Given that those are the groups who openly practise there, I can only imagine the list of occult factions who use the rooms on other days...
GPS Coordinates:
51.46038, -2.60659
Location: Tyndall's Park