"1 Anonymity - do not draw attention to rock art by signage "Do not deface this rock art" signs will not work and will be seen as a challenge" - Correct Peter, totally agree. Signage doesn't have to appear at a site, it could be by the paths that lead onto the moor. The Twelve Apostles <i>may<i/>benefit from signage but also needs some preservation work.
Education, and most specifically, education about living in a society. Many people don't respect the culture and community they live in, let alone its forebears.