In reply to toad:
yes I have heard that before. And in fairness there can be an element of truth in that. Although I'd hate to be on the crew that’s uncovering a land filled site for these future generations only to discover the membrane and clay bund allowed leachate to damage the precious treasure. Not that that would happen because highly trained engineers deal with it.
Why do all ecologists become Cynical.
My thinking is that if the crag can be climbed on the cost benefit analysis can rationalise its existance without being covered for future generations wrapped up in cotton wool. It would use similar systems to the method used by CABE to assign value to parkland (and maybe the DEFRA Local Sites Guidelines; multi use value system).