Geocaches at sites, leaving offerings, climbing on stones.... they're all the same argument and all irresolvable. Or are they?

If we all accept that the sites are our common heritage (and we probably do) all that has to be decided is what that means (which actually, I've never heard explained).

So...
does that mean we each have a right to interact and affect the site how we wish, since we each have individual ownership, or does that mean we don't, since none of us has individual ownership???

If the former's the case then the question of "how much" arises - Leaving a few daffodils? Leaving a plastic model of spiderman? erecting a toilet block within its ditch? putting a sheep trough adjacent to it or bringing a hammer to knock bits off to take home, buildind a house or digging a quarry right next to it? (Bear in mind NT and EH are guilty of two of those).

So, if someone would kindly define "common heritage" we can all sign up to it and stop arguing.

(BTW, this rant is fuelled by the fact that metal detectorists openly and almost universally claim that common heritage simply and solely means its their inarguable individual moral right to harvest it at will and without limit and take it home to store in a garden shed in Birkenhead).