I'm sure you're right to place no reliance on anyone that has the taint of government influence on them. Much better to listen to the bodies in the Stonehenge Alliance who have no axe to grind...
http://www.savestonehenge.org.uk/jointresponse300306.html

It seems likely they're going to be ignored imminently. My own guess is that the resultant row will be so stupendous that the plan won't go ahead, but if necessary I intend to self-immolate in front of the bulldozers. As a conservator, can i rely on you to join me?