12.—(1) The Chief Constable shall not refuse to grant, and shall not revoke or partially revoke, a firearm certificate in respect of a prohibited weapon or prohibited ammunition if the applicant or the holder is authorised by the Secretary of State under Article 45 to have possession of that weapon or ammunition.
(2) If the Secretary of State revokes an authority to purchase or have possession of a prohibited weapon or prohibited ammunition, the Chief Constable shall revoke or, as the case may be, partially revoke the firearm certificate relating to that weapon or ammunition.