reg 21 Right of access to aerodromes and other places
(1) The CAA has the right of access at all reasonable times to any of the places mentioned in paragraph (2) in order to— (a) inspect or copy any document or record for the purpose of monitoring compliance with the provisions of this Order; or (b) inspect any equipment or software used, or intended to be used, in connection with the monitoring of a person's exposure to cosmic radiation. (2) The places are— (a) any aerodrome; (b) any place where an aircraft has landed; (c) any premises for the time being controlled by any operator; (d) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (e) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (3) But access to a relevant area may be obtained only with the permission of the person in charge of the relevant area. (4) “ Relevant area ” means any place where an aircraft has landed , or an aerodrome, which is in the occupation of a visiting force or any department of the government of the United Kingdom.