edam - I think that the story goes that they had started to suspect that Deggsy was only 'talking' and finding out stuff that they had already told him in the research notes. So they planted a few false stories to test him. He then came up with the same stories via his spirit guide so they sacked him. That's Yvette's side of the story anyway (I think so, it was ages ago).
Its a bit bizarre though cos obviously its all a load of old crap so its all made up?
When you see her interviewed, Yvette is very likeable.