I had a quick look at the weekend and it seems they've upped the security with more cameras which weren't there when I last went in April/May... An impossible task I would say. Most of the windows and doors are bricked up from the inside too. Managed to get a peak into the mill through a hole in the wall and it's very much untouched, would love a walk round.
they have always been tight there but it has been visited since May for certain