a certificate issued by or on behalf of an authority appointed by a headquarters for the purposes of paragraph 2 of this Schedule stating that at a time specified in the certificate a person so specified either was or was not a military or civilian member of that headquarters and, if he was, belonged to any country so specified;

a certificate so issued stating that an alleged offence, if committed by a person so specified, arose out of and in the course of his duty as a member of that headquarters;