The RAF banned the practice of turnbacks when it realised it had lost 2 Hawks in 3 years practicing turnbacks, and hadn't had a single real one in 20. The statistical decision was that you lost less aircraft not practicing turnbacks but telling the pilot to eject if there was no runway within 30°. (I did the ADR analysis for the BOI on the second of those Hawks, anybody with back issues of AirClues, that's my hand plot of the flightpath around Valley).
The RAF teaches no more than 30° turn and find a field ahead in light trainers (Bulldog, Tutor, Vigilant) and I seem to recall that ejection was the preferred option in the Tucano, since if nothing else that may accelerate the day when HMQ has to buy a decent basic trainer.
G