My husband works in a building which is supposed to be one of the most haunted in Wales (if not the UK) and he takes people on ghost tours. They have, of course, had visits from "Most Haunted" as well as many other supposed psychics and mediums (media?). My husband says that Derek Acorah absorbed very rapidly all the content of the exhibition at the house and then regurgitated it for the programme, often with anachronistic results because he had confused the various owners of the house. The various psychics have been a source of much amusement as they often attempt to locate a ghost in a historic event which actually didn't happen (the history of the house is known as it was inhabited until fairly recently by the family of the caretaker).
Having said all of this, I'm quite prepared to accept that the house is haunted as I've had some odd moments when going around with the groups. My husband, on the other hand, is just impatient about the whole thing. But then it would be hard to lead ghost tours if you really, really believed in them, I think.

Anne