[holding answer 13 June 2008]: Section 1 of the Official Secrets Act 1911 makes it an offence for any person for any purpose prejudicial to the safety or interests of the state to approach, inspect or be in the neighbourhood of a ‘prohibited place’ or to make or otherwise obtain a sketch (a term which encompasses a photograph) which might be directly or indirectly useful to a potential enemy. All Government Communications Headquarters sites are prohibited places for the purposes of the Act.