(Streaming audio available in perpetuity or until the beginning of 2099, whichever occurs first.)
What's disturbing is that some of the people being exorcised should probably be undergoing treatment for clinical depression. Convincing them they are possessed by an evil spirit seems at the very least counterproductive.
Why do exorcists and their clients think that demonic possession is on the increase? Exorcists point to an alleged increase in interest in the occult, together with risky behaviour such as practising yoga, reading horoscopes, and an increase in new age forms of spiritualism. One Anglican bishop has said that clues to the presence of an evil spirit include "repeated choice of black, for example in clothing or colour of car".
During the course of the programme Jolyon Jenkins gets the opportunity to attend an actual exorcism, and he is given permission to record it. But at the last moment the exorcist tells him that he can't record audio of the event, only take notes. Undaunted, Jolyon Jenkins does just that, after which we are treated to a spirited re-enactment of the whole thing where he performs all the voices.
It's a well-made programme, and actually quite fun — but don't take it as gospel. (To be on the safe side though, you should avoid yoga, horoscopes and wearing or driving anything black. I always thought those London cabbies looked a bit suspicious....)
For another (far more sensational) take on demonic possession you should check out Bob Larson.