Actually, security for a Medway campsite where I suggested would be easy-peasy. There are only three ways to get in unless you want to cross electrified train tracks (or the Medway): Cory's Road, Blue Boar Lane, and a fair way down into Chatham entry, past Nag's Head Lane.

I didn't personally run into any situations in which I felt yob-threatened, but the sound outside the Enigma (as I went from the GI down into town) was unpleasant by 1500 hrs on Sunday and there was a ambience as if the yobs were gathering there specifically against the folkies. I came back to the GI, up Boley Hill and along the Vines at about 1830, and it was starting to look like having the potential of a running fight outside the King's Head. I'd guess the Enigma and the King's Head to be the most problematic venues.