Actually answering Camp Freddie's question...
CF,
I recently completed my FI course at an aerodrome which is embedded within Heathrow's Class 'A' airspace. The circuit height is 750', altitude 1,000'. Any higher than that, and you're inside the class 'A'. It's a darn sight easier to fly there on QNH in the circuit at 1,000' than on QFE at 750' - the long needle is straight up. The school I did the course at has all their students and hirers use QNH at all times and advocate its widespread use in the UK.
Now, I've just crossed the airfield to work for the other lot. They teach QNH for departure and QFE for arrivals and circuits. I adapt to whatever organisation I'm with at the time. The FISOs at this aerodrome know the requirements of the different schools and pass the appropriate infornmation to he relevant aircraft.
So there you are, one aerodrome, two different ways of doing things; for and against both arguments.
What I WON'T go along with and would object to having to teach, is setting QFE to DEPART from an aerodrome. That just doesn't make any sense to me at all and could lead to all kinds of issues, already discussed above.
Don't forget, when British Airways and other UK carriers changed to all-QNH operations a number of years ago, the RAF changed with them, then CHANGED BACK. How bizarrre is that? My main issue with RAF 'dromes, however, isn't the use of QFE but their frankly dodgy RTF phraseology which for low-houred pilots who have been taught proper ICAO/CAP 413 stuff is very confusing and illogical. But that's another story!
Cheers,
TOO