SCHEDULE 2Permitted development rights
PART 19Development by the Crown or for national security purposes
Class E – development on operational Crown land relating to an airbase
E.4
Development falls within this paragraph if—
(a)
it is urgently required for the efficient running of the airbase; and
(b)
it consists of the carrying out of works, or the erection or construction of a structure or of an ancillary building, or the placing on land of equipment, and the works, structure, building, or equipment do not exceed 4 metres in height or 200 cubic metres in capacity.