... The site is not a double-banked henge, but a double-ringed wood henge dating to 1000bce-400bce according to RC dating.
Excavation has stopped while a descision is made as to whether it is a National Monument or not. If it is deemed so then the motorway route will have to change. Full stop. End of story! (unless they change the law again, but I think this one would be constitutional and so need a referendum.)
The site lies under the entire width of the planned northbound carriageway.