Brize uses QNH, everywhere else in the UK Mil appears to use QFE. AIDU plates have both (M)DA and (M)DH printed on them, though the altitude rather than the height is the primary.
When flying IF some quaint ATC chat remains at military airfields such as confirming the minima over the radio and “cockpit checks, report complete” whereas civvies just expect you to know what you’re doing and be ready (or say if you aren’t) and there aren’t differing instrument rating limits so just one minimum. Always confuses the exchange pilots.