42.—(1) Paragraphs (2) to (4) shall have effect in relation to protective provisions for the benefit of authorities described in column (1) of Part I or II of Schedule 4, or their predecessors, contained in any local Act or in any order made under any Act.
(2) Any such provision for the benefit of an authority described in column (1) of the said Part I, or their predecessors, so far as it relates to or affects an area specified in respect of such authority in column (2), shall enure to the benefit of the authority so specified in column (3).
(3) Any such provision for the benefit of an authority described in column (1) of the said Part II, or their predecessors, so far as it relates to or affects an area specified in respect of such authority in column (2), shall, if it is appropriate that it should enure for the benefit of the authority so specified in column (3), so enure.
(4) Any provision which under paragraph (2) or (3) enures in respect of any area shall in relation thereto be construed as if a reference to the authority specified in column (3) were substituted for any reference to the authority described in column (1) or their predecessors.