6.—(1) In this Schedule—
(a)for the purposes of paragraph 2(1) and for the year 1999 “packaging materials” means any of the following—
(i)glass,
(ii)aluminium,
(iii)steel,
(iv)paper/fibreboard, or
(v)plastic;
(b)for the purposes of paragraph 2(1), and for the year 2000 and subsequent years, “packaging materials” means any of the materials referred to in sub-paragraph (a) together with wood and other packaging materials; and
(c)for the purposes of paragraph 2(3) “packaging materials” means any of the materials referred to in sub-paragraph (a).
(2) For the purposes of sub-paragraph (1), packaging materials composed of a combination of the materials there referred to are to be treated as made of the material which is predominant by weight.