In reply to Very Wild Camper:
Yester - Fences and claim of curtilege 1km from house, signs telling you to keep to core paths.
Gosford - cyclists bothered and signs demanding you only go in one way and pay (they claim they were a paid attraction beforehand, house and gardens maybe but not the greater estate)
Signs on the pylon road in the Lammermuirs (off the Longformacus - Gifford road) telling you to keep to the road. About 10 years ago I was chased by a keeper here. Degenerated into a slanging match across the Berwickshire march.
And of course the biggy! The well known and discussed abuse of park bylaws by Hysterical Scotland in Holyrood Park.