In reply to robert-hutton:
The sign has been there for ages.
I know someone who was climbing there once and was approached by a village local at the top, whilst belaying. She boldly asked them to keep coming to help prevent the development of the land!
However, I've also been told the cattle are a breed that are not allowed on public footpaths so they are potentially dangerous. They've always seemed very docile to me, but leave a wide berth when the calves are around, I guess.
Best natural inland limestone around. Love it!