The Air Navigation Order, as amended, sets out UAS Flight Restriction Zones (FRZ) around Protected Aerodromes for Unmanned Aircraft operating in the Open and Specific categories.
The shape of FRZ is constructed by using the airfield's existing aerodrome traffic zone and, where applicable, a Runway Protection Zone(s) with a shape five kilometres by one kilometre starting from the point known as the threshold at the end of each of the airfield's runways. Both zones extend upwards to a height of 2,000 feet above the airfield. Certain exceptions apply to the shapes of FRZ and RPZ and information regarding the exact dimensions of each FRZ/RPZ is published in the UK AIP (Section ENR 5.1 Prohibited, Restricted and Danger Areas).
An Aerodromes FRZ and RPZ(s) are contiguous irrespective of how mapping tools may portray them.
It is illegal to fly any drone at any time within these restricted zones unless you have permission from air traffic control at the airport or, if air traffic control is not operational, from the airport itself. (AIP Section ENR 1.1 contains information for UAS operators and aerodromes in relation to requesting and granting permission for any unmanned aircraft flight within an FRZ/RPZ).
A Protected aerodrome is one which is:
UK Licensed;
Certified;
UK Government;
Prescribed by the secretary of state for the purpose of being Protected.
All Protected aerodromes and details of their FRZ/RPZ Restriction Zones are published in the UK AIP, Section ENR 5.1 Prohibited, Restricted and Danger Areas. Every airfield's restriction will be different, but the diagram below gives a generic example of what FRZ/RPZ restricted zones look like.