The Town and Country Planning (General Permitted Development) (England) Order 2015 No. 596

SCHEDULE 2 Permitted development rights

PART 19 Development by the Crown or for national security purposes

Class L – use of buildings by the Crown on an airbase connected to air transport services etc

Permitted development

L.  The use of buildings by or on behalf of the Crown within the perimeter of an airbase for purposes connected with air transport services or other flying activities at that airbase.