7In section 31(4)—
(a)in paragraph (a), after “1990” there is inserted “ or a work subject to the Alkali Act ”; and
(b)for paragraph (b) there is substituted—
“(b)of the inspectors appointed under Part I of the Environmental Protection Act 1990 or, as the case may be, under the Alkali Act, to enforce those provisions in relation to such furnaces;”.