Many years ago ( 1989? perhaps ) at Mildenhall I saw a USAF JetStar used for calibration, it looked
awesome in wrap-around Euro1 camouflage. Looked more aggressive than most of the fast-jets!
Edit: found tiniest-ever photo of one of them:
http://www.anigrand.com/images/items...40A_real-1.gif
Sometime in the 1990s they changed to Beechcraft Hawker Whatsits ( 125s ) which looked pretty neat, too, but not as mean as the Lockheed jet.
I wonder if they still do it or has it been subcontracted too?