See here ….

http://www.bbc.co.uk/news/uk-england-wiltshire-30248826
.

…. and here’s a statement by The Stonehenge Alliance:

The Alliance warmly welcomes the apparent intervention of ICOMOS-UK who are advisers to UNESCO on the UK’s World Heritage Sites. Their letter could be a warning shot across the bows of Government. If the Stonehenge landscape is threatened with serious damage caused by road and tunnel building, then there is a possibility that UNESCO could place the Site on the List of ‘World Heritage in Danger’ which would be a major disgrace for the United Kingdom.
Please sign our 38 degree petition to The Transport Secretary. https://you.38degrees.org.uk/…/save-stonehenge-world-herita…