23.—(1) Where—
(a)a firearm certificate—
(i)relating to a firearm identified in a European firearms pass; or
(ii)in respect of which an Article 7 authority has been issued,
is varied, revoked or cancelled;
(b)the Secretary of State gives notice that any European firearms pass needs to be modified by the addition or variation of any such statement as is mentioned in Article 19(3)(e); or
(c)the holder of a European firearms pass applies to have particulars of another firearm added to the pass,
the Chief Constable shall make such variations of the pass or authority as are appropriate in consequence of the variation, revocation, cancellation, notice or application or, where appropriate, cancel it.
(2) For the purpose of paragraph (1) the Chief Constable shall by notice in writing require any person who is or has been the holder of any firearm certificate to produce or surrender any European firearms pass or Article 7 authority issued to him.
(3) The Chief Constable may at any time—
(a)revoke an Article 7 authority issued under Article 22(4); and
(b)by notice in writing require the holder of the authority to surrender it.
(4) Where a firearm identified in a European firearms pass is lost or stolen, the holder of the pass shall immediately—
(a)inform the Chief Constable about the loss or theft; and
(b)produce the pass to the Chief Constable for him to endorse on it particulars of that loss or theft.
(5) Where a firearm to which an endorsement under paragraph (4) relates is returned to the holder of the pass in question, the Chief Constable may, on the production to him of that pass, make such further endorsement as may be appropriate.
(6) A person—
(a)who fails to comply with a notice given to him under paragraph (2) or (3) within 21 days from the date of the notice or within such further time as the Chief Constable may in special circumstances allow; or
(b)who fails to comply with any obligation imposed on him by virtue of paragraph (4)(a) or (b),
shall be guilty of an offence.