They have in 1995 !
And just to be complete in evidential terms about that fatal mid air. Not mentioned in the official written report was the fact that the FRC's ( compiled and endorsed by RAF Handling Sqn at Boscombe) were incorrect with reference to Canopy jettisoning, which may have prevented the safe and timely egress of the two fatalities. The FRC Emergency Drills Card 4 read as follows:-
" pull (back) both red handles fully back simultaneously,
"push canopy up and away"
"Release seat harness"
"Stand and bale out over the cockpit side"
the fatal error being that the RH handle was spring loaded and thus when removing R Hand to push canopy up with both hands, the hinge pin re-engaged and prevented canopy release. Thus whilst there was an airmanship issue and a degree of negligence, in colliding mid air during thermalling, there was a major contributory survival issue.
Arguably had the FRC's been correct, then two fatalities would have been avoided.