Clarification maybe needed for some, as I get the impression some poeple think that all the RAF use is QFE below TL.
IIRC for CCTs and App the RAF use QFE but once leaving the airfield set QNH, RPS or 1013 to go enroute as QNH/RPS will give you better terrain awareness. QFE may be set when transiting passed an airfield for coordination with cct traffic.
So does it really matter what the RAF use if you are not interacting with them?
For airdrop a local QNH, RPS or altimeter set using the radalt over terrain of know height was used.
I used QFE in the civvy world the other day when I had a double engine failure climbing out of Chambery and for the subsequent turnback, because of the very high workload it was the easiest way to know my height above touchdown for the PFL. Yes it was in the sim.