I do wonder, with security that active, what on earth they'd do were someone to buzz the site with a drone + GoPro set-up, being sure to get nice shots of all secca present. You'd have to limit the run to a couple of minutes, and you'd want at least one other video camera recording the events from other angles, as I suspect that a hi-vis re-run of a Keystone Kops comedy would ensue. Certainly that response would be "Oh look, someone's filming the site and breaking the cordon, panic stations, let's run round like idiots wondering what to do", and filming it would be entertaining if nothing else.