9.—(1) A licensee must not irradiate food in combination with any chemical treatment having the same purpose as irradiating it.
(2) Subject to sub-paragraph (3), a licensee must not irradiate food which, or any part of which, has previously been irradiated.
(3) The removal of food from, and its return to, the facility where irradiation takes place does not constitute a breach of sub‑paragraph (2) where they form part of a continuous process required by the design and construction of that facility.