6(1)For the purposes of this Schedule, a “UK industry” in particular goods means—
(a)all the producers in the United Kingdom of like goods (see paragraph 7), or
(b)those of them whose collective output of like goods constitutes a major proportion of the total production in the United Kingdom of those goods.
(2)Regulations may make provision for the purposes of sub-paragraph (1)—
(a)about what constitutes or does not constitute—
(i)a producer in the United Kingdom of like goods;
(ii)such a producer’s output of like goods;
(iii)the total production in the United Kingdom of like goods;
(iv)a major proportion of that total production;
(b)about how any of those matters are to be determined.