Have now had a chance to read two of Dr Fontana's papers, many thanks
@Eponastill
There was some interesting new information and for the record the 'Strange but True' version wasn't that far off the actual narrative.
For me, the fact that they found small hoards of the stones that 'Pete' allegedly threw stashed away up behind the false ceiling tiles opens up some interesting possibilities, especially as sometime the staff would pretend to throw a stone and yet still receive one back. Of further note is that the stone throwing ceased when a certain employee left and they reorganised the workshop.
Then there is the fact that the landlord of the premises tipped off the press about the goings-on at a time when the business owners didn't want publicity and numerous calls made to the house of one of the owners but no-one answered when the phone was picked up. These two facts couple with them finding that disturbances were taking place in the workshop overnight does make me wonder if either a former employee had a grudge or the landlord was trying to unsettle them (they would eventually move out, but did the landlord want them out sooner?).
To my mind these facts give the skeptics a bit of ammunition. How big was the space above this false ceiling, who had keys to the workshop other than them and how were they getting on with their landlord? Or was there a former employee with a grudge at work here?
That said, there ere numerous witnesses to these events and it is certainly not easy to make the case for human trickery. I have personally witnessed some minor poltergeist activity I wasn't able to explain and I do feel that at the very least there was some poltergeist activity at the core of the goings-on. Perhaps this in turn created a heightened state of awareness amongst the staff to the extent that a customer dropping their £5 note change on the floor would be attributed to 'Pete' gifting them money. However, the possibility of human trickery at play remains a nagging doubt and I feel that more questions ought to have been asked about key holders, relationships with current and former employees and their landlord.
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@Eponastill - are you happy for the papers you found to be posted to this forum as attachments?)