1:6 scale model of AA No. 1 Mk. 2 radar transmitter

Radar, Anti-Aircraft, or simply AA radar for short, was a classification system for British Army radars introduced in 1943 and used into the 1960s when these systems were replaced by missiles with their own integral radar systems.

AA Number 1 was assigned to the early gun laying radars operating in the 1.5 m VHF band. They were almost always referred to by their original name, Gun Laying (GL) Mk. I radar. AA No1 Mk2 was a Gun Laying 2 (GL2) early warning and fire control continuous tracking radar system in use from June 1940 to August 1943. 1679 were ordered and 204 were supplied to the USSR.