There was an interesting case at Mildenhall in 2004,someone apprehended by a policeman as he left the Cunetio roman town site there with coins, etc, but the case never went through.... its a site that has never been excavated..
There's an account, of sorts, of that incident here (halfway down) http://216.239.59.104/search?q=cache:BT9YyzMGxSwJ:www.detectorists.net/news1.html+Cunetio+nighthawk&hl=en&ct=clnk&cd=1&ie=UTF-8
I'm saying nowt, as I'm known for my fairmindedness...