ATCO 2
The Military use QNH IAW the procedural charts at civilian airports and have the choice of using QNH or QFE from the FAF. If the approach is to be flown entirely on QNH, ATC must be informed since it is assumed by ATC that QFE will be the landing datum. The aircraft will then be given the airfield landing threshold elevation.
At military airfields QFE is the landing datum for all RAF aircraft.
The inference that the military now use QNH is based on a trial some 10 years or so ago where the only pressure setting used was QNH. Unfortunately the fast pointy aircraft operators always liked to see 1000ft indicated in the circuit and 200ft at DH. They found the mental gymnastics a distraction for single seat and lobbied for the return to QFE, a mistake in my view.