A drone or UAV must not be flown within 4 kilometers (2.5 miles) of any aerodrome. To fly in controlled airspace drone pilots must obtain an air traffic control clearance issued by Airways.
If you are a certified 101 pilot, you can ask permission to fly in and around an aerodrome, heliport or helipad, airport or airstrip (all of these are in included in the rule as a definition of an aerodrome).
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Here’s the chapter and verse from CAA
This rule outlines requirements relating to flying off an uncontrolled aerodrome, a controlled aerodrome, and within 4 km of an aerodrome.
Any unmanned aircraft flying activity within these areas requires the pilot/operator to either be:
(a) the holder of, or to be supervised by the holder of:
(i) an approved organisation pilot qualification:
(ii) a pilot licence issued under Part 61:
(iii) a microlight or glider pilot certificate issued by a Part 149 organisation:
(b) under the direct supervision of a person appointed by an approved organisation to give instruction in unmanned aircraft operations.
These requirements do not apply to a person flying within 4 km of an aerodrome, if the activity is a shielded operation and is conducted outside the airfield boundary.