At an airfield far far away...
ATC "1234 set QNH 1008 mbs"
Pilot "Negative, request QFE. We're British military and we fly on QFE."
ATC "1234, this is a QNH airfield and procedure. I say again, set QNH 1008 mbs"
Pilot "Well, I say again, we're British military and we fly on QFE"
ATC "1234 roger, have it your way, set QFE 817 mbs"