CAP 168 chapter 6
11.1.3 The control of an AGL system from beyond the boundary of a licensed aerodrome will
only be approved by the CAA for the sole use of the emergency services. Where this
type of control is desired, an operational requirement proposed by the aerodrome
authority and supported by the emergency services involved should be submitted in
the first instance to the CAA.
It specifically says "licensed aerodrome"