Someone elsewhere mentioned something that might come back to bite us.
EH, in investigating the site of their own proposed visitor's centre, characterised what they found as of "local importance" only. Tarmac might sieze on that as the perfect point of attack.
EH would argue "Ah but that's not part of the Stonehenge landscape or setting" but would we believe it ourselves? .... (gulp!)
I don't know the proposed Stonehenge visitors site very well, other than it's just outside the WHA. Is it part of the Stonehenge viewshed or landscape or setting?