Not a momentary action – it required squatting down at the back and painstakingly scraping away the rear surface, something that would have taken quite a few minutes of hard work.

The notice was giving details of the DEFRA Countryside Stewardship Special Project which protects both the natural and archaeological aspects of the World Heritage Site and it’s hard to see how that could prompt such an attack.

UPDATE:  Culprits exposed! See Comments.