18.—(1) The power of a designated customs official to seize and retain evidence found upon a lawful search of a person or premise under section 19 of the Act, as applied by article 12, shall have effect notwithstanding that the offence to which the evidence relates does not relate to a general customs or customs revenue matter.
(2) Nothing in the application of the Act by virtue of article 12 prevents any thing lawfully seized by a person under any enactment from being accepted and retained by a designated customs official.
(3) Section 21 of the Act (access and copying), as applied by article 12, shall not apply to any thing seized as liable to forfeiture under the customs and excise Acts.