Goffik,
The bottom link is the excavations of several mounds and a ring of postholes on Porton down in preparation for a new airport and new road when they finaly widen of the A303.
I believe Wessex archaeology are doing the business but I wouldn't hold my breath awaiting any reports as it has been a long process.
Every time they move some more earth something else pops up.
I see this often when flying in and out of Thruxton airfield (sorry, I don't take passengers anymore)