Interesting. But then you'd have to tell officials the location in advance. And if the site is MOD land...
MOD land eh?
with the farmers permission?
in that case what you need to do ideally is get the farmer to tell the camp commander / head boy at the army base that he's planning to have a party on his land for his sons birthday / engagement party / whatever on x date for a couple of hundred people, and get permission.
Providing the farmers not having problems with the camp commander, the chances are that he'll be fine with it - bigger things to deal with - so long as it doesn't conflict with any military exercises etc. and let's be honest, you don't really want to find a load of squaddies storming through your party on exercise do you.
the beauty of this situation is that the normal police can't come onto MOD land without getting permission from the camp commander / head of the MOD police. and basically so long as you've got permission for the party, it'll be a brave local plod that forces them to wake up the camp commander at 3am to get permission to come on site to close down a party that he's given permission for.
It's not a total get out clause, if you're getting loads of noise complaints then either the mod police will give the normal plod permission to come on and close it down, or more likely the mod plod will come and have a word - if this happens don't piss them about, they're used to dealing with squaddies.
We did one years ago on mod land like this, and the only thing the local police could do was blocade the end of the entrance road for a couple of hours - but after we'd got pretty much everyone in anyway. We'd had a visit from the mod police in the afternoon, when we actually had a band on, so had them do a half hour accoustic no beats set( so the Criminal justice bill couldn't apply) while they were there, then cranked it up in the evening / night. the next time the mod plod came down was the next night when we were just finishing packing up to tell us that there were a few hundred squaddies about to come over the hill on exercise, so we might want to get the fuck out of there. We did then get loads of hastle from the local police when we camped up nearby for the night, with them doing a drive past every half hour til we'd left... they were looking for the rest of the new age travellers convoy that they presumed was somewhere about. We did try to tell them that everyone else had gone home, and there was no convoy, but they didn't believe us
basically using MOD land with the farmers permission, if the farmer get's permission from the mod camp commander is a good blag, and it's less likely you will get busted, but you do need to do it properly, and make sure there is no comeback for the farmer from the mod. If you take the piss, then you'll not just have the local plod to deal with, you'll have some very pissed of military police and a camp comander on the warpath because he feels he's been made a fool of. Generally though the military have got bigger things to worry about, and want to keep the farmers happy.