The most effective way to get onto the site now would appear to be the old standard dressing up trick.
So, suit, hard hat, fluorescent waistcoat and clipboard together with a large form marked up as a security response checklist. Walk onto site, photograph everything including wildlife, and record where you were on the form together with times. When the copper turns up, record this as well and try to get him to counter-sign the form, just for the record!
At this point terminal confusion will set in, since police officers are just not mentally prepared for someone else's bureaucracy to be thrown at them. Trying for an arrest under the Vagrancy Act would also be rather difficult, given that the person they just tried it on obviously isn't a vagrant. Most likely, you would just get escorted off the site; bonus points for recording when you leave the site and getting the officer to initial that as well!
So, suit, hard hat, fluorescent waistcoat and clipboard together with a large form marked up as a security response checklist. Walk onto site, photograph everything including wildlife, and record where you were on the form together with times. When the copper turns up, record this as well and try to get him to counter-sign the form, just for the record!
At this point terminal confusion will set in, since police officers are just not mentally prepared for someone else's bureaucracy to be thrown at them. Trying for an arrest under the Vagrancy Act would also be rather difficult, given that the person they just tried it on obviously isn't a vagrant. Most likely, you would just get escorted off the site; bonus points for recording when you leave the site and getting the officer to initial that as well!