I watched this clip from the BBC News site: link
As soon as landowners talked about people following "the spirit of the law instead of the letter of the law", I thought "sod that". As I've said in the past, the letter of the law is good enough - these guys aren't "wild campers", they forfeit the right to access as soon as they disobey the law.
Leaving litter, using a heavyweight tent chucked out of a car, lighting fires in an irresponsible way, etc etc. All are handled within the letter of the law, not the spirit of the law. I must have said this before, folks: RTFM. These lawbreakers are not wild campers. Education and enforcement are the issues, not the law.