You'd have to be a bit more specific, but I believe it is MATZ (Military Aerodrome Traffic Zone), the airspace surrounding a UK military aerodrome. The airspace is to provide protection to military aircraft traffic in the critical stages of circuit, landing and takeoff.

Military special intelligence is a discipline that exploits a number of information collection and analysis approaches to provide guidance and direction to commanders in support of their decisions. Nations performing military intelligence routinely eavesdrop on broadcasts of national and local radio and television, local military traffic, radar emissions, and even microwaved telephone and telegraph traffic, including satellite traffic.

For military traffic and local communications.

It is advised that you take care of all traffic tickets before you enlist in the military. While you can technically enlist without taking care of the tickets, you can be discharged for fraudulent enlistment if the military does find out.

Transportation Officers