Paragraph 48 Development by Civil Aviation Authority for air traffic control and navigation

the provision of air traffic control services;

the navigation of aircraft; or

monitoring the movement of aircraft.

any building erected would be used for a purpose other than housing equipment used in connection with the provision of air traffic control services, assisting the navigation of aircraft or monitoring the movement of aircraft;

any building erected would exceed a height of 4 metres; or

it would consist of the installation or erection of any radar or radio mast, antenna or other apparatus which would exceed 15 metres in height, or, where an existing mast, antenna or apparatus is replaced, the height of that mast, antenna or apparatus, if greater.