This has been touched upon under another topic where I said I wouldn't say anymore until I had something useful to contribute. Here it is:
https://highwaysengland.citizenspace.com/cip/a303-stonehenge/
Please read and comment if you wish (not necessarily here). Stonehenge is as mysterious and enigmatic as some of the more far flung ancient monuments in the British Isles - it really is. Lets get this road/tunnel decision right for posterity.
A knowledgeable friend who probably would not want to be named here says:
"Time is short so please friends start reading and sharing to stop the tunnel."