Here's a better view - click on the dark panel to make it disappear.
http://www.flashearth.com/?lat=52.60....2&r=0&src=msl
BTW - Look at the facilty just south of the A47.
Some former V bomber stations have a similar feature (Waddington, Honington) but others don't (Cottesmore, Scampton). I guess it's a bomb-dump but it's not like the grassed over bunkers found on all V-Force stations. Any thoughts?