In reply to JohnBson:
I have met 'the feds' in the Millstone car park when a rave was getting underway, they were utterly useless, I can't imagine what the young raver thought they were going to do to him.
I went back one evening to look for a cam I'd dropped somewhere, and found a steady stream of taxis arriving at the car park, dropping people off to stagger away towards the quarry. There was a Derbyshire patrol car sort of cruising up and down, and while I was sitting in my van they shone their light right in my face and had a good look at me. So I hopped out, as you do, and wandered over to them to have a chat - it was bizarre, two apparently fully grown coppers really didn't want to talk to me and almost flinched when I went over. They were very reluctant to roll the window down. (I'm a big lad, ish, but not remotely scary.)
So, during our stilted conversation we established that they were Derbyshire coppers, not S Yorkshire, and that Lawrencefield was in their jurisdiction but not Millstone. I asked them if there were also things happening in Lawrencefield that night "We don't know". "Oh right", says I, "You've not been down there to have a look then?" "Ooh no, we can't go down there at night, health and safety you see."
I asked them, as Millstone is in South Yorkshire, if their colleagues in the neighbouring force were aware. "Yes of course, we always keep our colleagues informed about this kind of thing."
After I got home, an hour or so later, it suddenly occurred to me to give the Sheffield control room a call (this was before '101') - just to check they knew there was a rave going on, not that there was much they could do about it. "We had no idea Sir, thank you for letting us know."
Never did find that cam.