(1) A head may refuse to grant a request under section 7 if the record concerned contains matter relating to the deliberative processes of a public body (including opinions, advice, recommendations, and the results of consultations, considered by the body, the head of the body, or a member of the body or of the staff of the body for the purpose of those processes).
(a) Notwithstanding subsection (1), a head shall refuse to grant a request under section 7 in respect of a record in relation to which a Secretary General of a Department of State has issued a certificate in writing stating that the record contains matter relating to the deliberative processes of a Department of State.
(b) Where a certificate under paragraph (a) is in force and the Secretary General of the Department of State concerned is satisfied that the deliberative processes concerned have ended, he or she shall, by certificate in writing, revoke the certificate and, thereupon, paragraph (a) shall cease to app