Air Eng training
It's not as if this has come as a surprise to the RAF (well, maybe it has) but their airships were told on many occasions that Engineer training should not have been curtailed when it was.
All the course material is available (I put aside the AEPT stuff) but the main problem is implementing a course. The AEPT is now no more than a large amount of widely dispersed pieces, and the pool of experienced instructors is also widely dispersed.
To run the course the RAF would need to withdraw Eng's from the front line to be instructors which will only exacerbate the current manning problem. However, for a suitable fee (!), I'm sure I could get sufficient, instructor qualified, retired Engineers together to run a suitable course! It's all part of my retirement plan!
Sadly, I doubt the bean counters would put forward sufficient cash for my pet project so I suspect I may have to graft elsewhere for a little longer.