11(1)Building regulations may repeal or modify—
(a)any of the following provisions of this Act: sections 15, 18 19, 21 to 29, 41, 59 to 87, 91 to 119, 123(2) and 126 (except as to the definitions of “contravention ”, “local authority ” paragraph (a), “modifications ”, “plans ”, “prescribed ” and substantive requirements"), and paragraphs 1 and 5 to 14 of Schedule 3, or
(b)any provision of an Act passed before the 20th September 1974,
if it appears to the Secretary of State that it is inconsistent with, or is unnecessary or requires alteration in consequence of, any provision contained in or made under any enactment relating to building regulations.
(2)Building regulations may—
(a)repeal or alter section 12(1) of the [1976 c. 57.] Local Government (Miscellaneous Provisions) Act 1976 (byelaws as to supply of heat) or any provision of byelaws in force by virtue of it, and
(b)make any modification of section 12(2) of that Act that the Secretary of State considers is appropriate in consequence of the repeal or alteration.