It's a charity.
http://www.wisdomoftheancients.com/ouroboros.htm
Apparently.
They've been working on the place for a while. They stopped at one point because of not having the money to pay VAT as well as costs ... hence getting charitable status.
It's what was, until recently, an iron foundary. My folks live just outside Dolgellau and know the bloke who used to own the building and all the local councillors etc so I'll get them to keep me posted.