Bickley Battery - F2 Magazine
Particularly as the magazines are yet to be refurbished, both windows of F2 Magazine are locked with the original metal plate shutters and bolts. The windows to the doors are covered with Perspex-type windows, limiting the view inside, particularly as many dipshits have engraved crap on the surface.
Asbestos contamination would very likely be an issue, judging from the era it was constructed in. Although of course, feral nutsacks scribbling on the walls of important and historic infrastructure is ever so constant, no doubt in a desperate bid for attention and selfishly ruining it for everyone else.