Would it not be possible to keep the site listed if it was made clear that it is on private land and permission must be sought before visiting? Possibly via inclusion of a 'miscellaneous' post?
There are quite a few sites on here that are on private land, but are happily catalogued nevertheless.
Hello Rich , Looks like things down you way havn't changed much since the 30's regarding landowners attitudes ,access etc. Maybe another Benny Rothman is required .