HeliComparator and Flyer43,
That terrible training accident was the final thing that made the RAF change the way it carried out its own OEI training.
We began to use simulators for much of the stuff we had previously done "live". Although an unpopular move in the eyes of some pilots, it led to a much better trained workforce.
Simulators also allowed us to think more about tail rotor control malfunctions, rather than "simple" tail rotor drive failures and there is at least one contributor here who possibly owes his life to that training. Perhaps he will post something about his experience in that respect.