19.—(1) A person who undertakes an activity involving genetic modification of organisms other than micro-organisms shall apply the containment measures selected in accordance with the assessment made pursuant to regulation 7(1).
(2) That person shall review the containment measures applied by him in accordance with paragraph (1)—
(a)at suitably regular intervals; and
(b)forthwith if that person suspects that—
(i)the containment measures applied are no longer adequate, or
(ii)in the light of new scientific or technical knowledge, the assessment referred to in paragraph (1) is no longer valid.