EH say there is no suggestion that the project is under threat.... http://www.salisburyjournal.co.uk/news/salisbury/salisburynews/4245764.Time_short_for_Stonehenge_visitor_centre_decision/
They "will not reveal their "preferred location for the centre" but their disagreement with NT has been settled and "we have put one recommendation forward from all the stakeholders".
I read that as "NT and all the rest have won" and it'll be at Airman's Corner....
20 years and £37.5million to finally extract a half-decent non-damaging, obvious solution out of EH and the government. It's been fun. Not.