5.—(1) Schedule 8 to the principal Regulations is amended as follows.
(2) In paragraph 1(1), at the beginning insert “Subject to sub-paragraph (1A),”.
(3) After paragraph 1(1) insert—
“1A. Where installations are Part B installations solely because of the aggregation of the rated thermal input of 2 or more appliances in accordance with paragraph 2 of Section 1.1 of Part 2 of Schedule 1, only paragraph 4(1)(a) of this Schedule applies to those installations (in addition to the provisions in Schedule 8A)”.