QFE, altimeter pressure setting to show zero elevation when on the ground, is used by the UK military. I believe procedure is for QFE to be used in the vicinity of the airfield until climbing above transition altitude (which varies between 3000ft and 6000ft in the UK at present) when 1013 is set. QNH is only used at those miltary airfields situated under terminal control areas.
For UK civil, QNH is the normal setting although the CAA still allow use of QFE at some airfields.