6Integrated chemical installations, that is to say, installations—
(a)for the manufacture on an industrial scale of substances using chemical conversion processes; and
(b)in which several units are juxtaposed and are functionally linked to one another and which are for the production of—
(i)basic organic chemicals;
(ii)basic inorganic chemicals;
(iii)phosphorus-based, nitrogen-based or potassium-based fertilisers (that is, simple or compound fertilisers);
(iv)basic plant health products and of biocides;
(v)basic pharmaceutical products using a chemical or biological process; or
(vi)explosives.