Actually, Nigel, by drawing public attention to the fact that the hill is in a dangerous state because of neglect (if not negligence) you place EH in a difficult position. If someone was subsequently injured whilst trespassing on the hill, EH could not argue that they (EH) were unaware of the risk. You could claim that you had been trying to draw their attention to this risk, but they had ignored your warnings and had torn down your signs (if they had) that you had placed there in the public interest.