One of the greatest things ever shown on tv. At the time, it had me completely. There had recently been a programme called "Hospitalwatch" and this was billed in the same way. The beeb was absolutely dragged across the coals for this. Some poor guy killed himself, he was so disturbed by it. Massively influential in the horror/found footage genre. I've got it on dvd. Not sure if it's still available. Watching it after the fact, some of the acting is a bit hammy but it's a great story, albeit heavily indebted to the Enfield Poltergeist, which wasn't as well known then as it is today.