4.—(1) The powers conferred by a warrant must not be exercised to take possession of or copy any written or electronic record subject to legal privilege (within the meaning of section 10 of the Police and Criminal Evidence Act 1984(1)).
(2) If possession is taken in error of any record of the kind referred to in paragraph (1), the record must be returned, and any copies taken must be destroyed, as soon as it is identified that the record is subject to legal privilege.