2-BLUE landed at Upper Heyford which I think is partially decommissioned as a base.
There is also a similar aircraft 2-POSH flitting around in a similar way.
I was also tracking this one -
FA50 N85TN 36025 ft 5651 Military India Dassault Falcon 50 No 800200 LLS Aviation LLC.
It was listed as Indian military with a US civvy reg number flying deep over the Pacific 200 miles SE of Tahiti hdg NW.