CCTV?
@albino-jay With the whole site being ABP and gate access for cars, there's CCTV dotted about everywhere and I think they caught on to us walking round on a rainy Sunday afternoon - the whole area was otherwise empty
@EOA yeah... I should have tagged on when apple maps refused to give me directions there - street view would have been my friend! The guy was friendly though and had a bit of a joke, although he probably didn't realise our intentions