16.—(1) The Chief Constable may by notice in writing to the holder of a visitor's firearm permit revoke the permit or vary the conditions subject to which it is held.
(2) Subject to paragraph (3), where the Chief Constable revokes a visitor's firearm permit, he may by notice in writing require the holder to surrender it, and if the holder fails to do so within such period as may be specified in the notice or within such further period as the Chief Constable may in special circumstances allow, the holder shall be guilty of an offence.
(3) If an appeal is brought against the revocation, paragraph (2) shall not apply unless the appeal is abandoned or dismissed and shall then apply with the substitution for the reference to the date of the notice of a reference to the date on which the appeal was abandoned or dismissed.