Finding boosts theory that circle’s giant stones – known as sarsens – were moved at about the same time, a sign that builders were from a highly organised society.

Some 20 or more massive shafts forming a circle more than 10 metres in diameter have been uncovered close to the ancient settlement of Durrington Walls.

When it comes to public access to Britain’s most visited attraction outside London, heritage bodies are walking a fine line between exploitation and conservation