Mega, you're exactly right about the UK system. A lot of USA md'rs are confused about that. They think it's a grand idea, about the supposed love-affair of museum/archies/md'rs. Ie.: they "buy you out" if you find a cache or something, blah blah.
But as your post shows, very few UK hunters are hunting public land (parks, schools, forests, etc....). Instead you guys are 99% private land with permission. Thus the UK system is NOT some sort of "carte-blanche" to detect nilly willy. And it DOESN'T allow on most public land (d/t all the resources belong to the queen, blah blah). Contrast to the USA, if you find a cache on farmer Bob's land, it's totally between you and farmer bob what you want to do with it
But as your post shows, very few UK hunters are hunting public land (parks, schools, forests, etc....). Instead you guys are 99% private land with permission. Thus the UK system is NOT some sort of "carte-blanche" to detect nilly willy. And it DOESN'T allow on most public land (d/t all the resources belong to the queen, blah blah). Contrast to the USA, if you find a cache on farmer Bob's land, it's totally between you and farmer bob what you want to do with it