5. No person shall, other than for research and development or analysis purposes—
(a)use wood treated with PCP, other than structural timbers, inside buildings whether for decorative purposes or not and whatever the purpose of the buildings, or
(b)use wood treated with PCP for the manufacture of—
(i)containers intended for growing products for human or animal consumption, or
(ii)packaging or other materials which may come into contact with or contaminate raw, intermediate and/or finished products intended for human or animal consumption,
or for the re-treatment of such containers, packaging or other materials.