Four Saudi GR1's or IDS have been at Warton now for over a year, they've had some sort of modification/upgrade already and one or two are now out test flying.
They've all had the Saudi flag painted over and replaced with the letters T.S.P (Totnado Sustainment Programme). All have British reg's and RAF roundels applied.
Link to pic:
http://www.airliners.net/open.file?i...ext_id=1032808