this kinda looks to fit the bill:

http://www.themodernantiquarian.com/site/582

Do any 'officials' check such events as this?

Precisely, I'd guess it's at Warborough Farm:

http://www.multimap.com/map/browse.cgi?client=public&X=437500&Y=185000&width=700&height=400&gride=439834.258427899&gridn=187938.669141548&srec=0&coordsys=gb&db=freegaz&addr1=&addr2=&addr3=&pc=&advanced=&local=&localinfosel=&kw=&inmap=&table=&ovtype=&keepicon=true&zm=0&scale=50000&multimap.x=401&multimap.y=174

(sorry for the crap url)