Finally, can anyone suggest why the younger instructors in the UK are not teaching 60 degree banked turns?
In the majority of cases I suspect that schools have not updated their training manuals since the introduction some ways back, so if it wasn't there then it wouldn't be now. I would suspect the desire for schools to teach 'more' than what is in the syllabus is driven by time/cost constraints. I know I was taught them, 20 odd years ago and have taught them since - along with teaching navigation by compass which seems to be becoming a 'forgotten art'.
I ensure that all of the FI candidates I teach are able to teach to both 45AoB and 60AoB but see the norm during the discussion is that 60AoB is seen as a 'pusher' (challenge) for those who get 45AoB early in the lesson.
I do also teach maximum rate turns to those candidates, but I would suggest that over 90% of those haven't seen one before, let alone been taught to do one.