Such a BBC article. They tracked down a former employee of the cigarette factory to say:
“The filters would be very good #insulation, and someone had a light bulb moment and probably bought this as scrap off their manager. The word would have spread quickly through the factory that this was indeed a great job, and I would say it was a cheap way of insulating the roof space.”
Before at the very end stating the bleeding obvious, this is a huge fire risk. Don’t do it.
