Bismark,
The RAF still does a traditional OCU post 60 Sqn. CHF, in the past, has traditionally skipped 60 Sqn and done 'the crew thing' on 848. The increased costs and complexity of the Merlin may well force them to do 60 Sqn (as I believe RN pingers have done for a while...). 848, in effect, have acted as a AFT for CHF - a situation that might be unaffordable in the future.
AFT is just that, I take OFT is CTR to LCR standard after which further training is required to achieve a CoC (CHF) or CR (RAF) - or have I got this wrong?
My point is that Trimmers/Beefers/QHIs have traditionally done the whole course in the RAF - a CTT/CTR split would permit the tactical experts to preach the gospel according to the tactics manual rather than 'thrapping to equality' over the vector diagram....