13. In paragraph 5 of Part 1 of Schedule 5—
(a)at the end of sub-paragraph (1) insert—
“(f)a medium combustion plant or a specified generator, unless the regulator determines that the operation of the medium combustion plant or specified generator may have significant negative effects on human beings or the environment”,
(b)after sub-paragraph (6) insert—
“(7) When assessing whether the operation of a medium combustion plant or a specified generator may have significant negative effects on human beings or the environment, the regulator must consider only its emissions to air.”.