Firstly with regard to dog disturbance I have wintnessed the dog disturbance at Newport (Pembs) plenty of times & get so frustrated by it that I rarely go there. I may miss some stuff but at least can stay slightly calmer than if I witness some dog owners recklessness!
Secondly, my son used to warden a site on Anglesey. There the wardens have a 24 hour watch & intersept people heading for the tern colony. Some people can be devious to try to get out to the site, but the wardens always challenge politely, & as far as I understand they never had a major problem. Maybe a warden will get away with being polite but firm, whereas the word of a birdwatcher has less authority.
But an open note to wardens; there are plenty of us, dog owners included, who want you to stop the irresponsible owners from being totally pigheaded & acting like idiots. we supoport you wholeheartedly!
m wilson