The Import Duties (Exemptions) (No. 1) Order 1950
Whereas leaves, stems and roots of the plant known as henbane (hyoscyamus muticus), being natural raw materials in a dried state, not chopped, ground, manufactured or prepared, are included in the First Schedule to the Import Duties Act, 1932(a), and accordingly are exempt from the provisions of section one of the Act:

And whereas the Treasury, after consultation with the appropriate department, are of opinion that the whole plant or any part thereof, being such material as aforesaid, ought ...