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 K – use of land by the Crown in relation to surveys etc

Permitted development

K.  The use of land by or on behalf of the Crown for the stationing and operation of apparatus in connection with the carrying out of surveys or investigations.