20 Jan 1971.
Two Gnat T.1 of the CFS "Red Arrows" aerobatic display team (XR545 and XR986) collided and crashed during a synchronised pair display practice at Kemble, Gloucestershire. Mid-Air Collision between synchro pair. Wings clipped during an opposition manoeuvre `Roulette'
All four crew (two in each aircraft) were killed. Crew of XR545 (call sign "Red 7") were reported as being Flight Lieutenant John Haddock and Flight Lieutenant Colin Armstrong