(1)The provisions of this Act authorising the carrying out of the works (“the works powers”) shall have effect notwithstanding—
(a)the provisions of the [1990 c. 9.] Planning (Listed Buildings and Conservation Areas) Act 1990; and
(b)the provisions of the enactments relating to historic buildings and ancient monuments;
and section 42 of the [1976 c. 57.] Local Government (Miscellaneous Provisions) Act 1976 (certain local Acts, etc., to be subject to the planning enactments, etc., except as otherwise provided) shall not apply to the extent that it would make the works powers subject to those provisions:
Provided that nothing in paragraph (a) above shall apply in relation to—
(i)works for the demolition of any relevant building other than one specified in Part I of Schedule 6 to this Act; or
(ii)works for the permanent alteration or extension of any relevant building, other than one specified in Part I or Part II of that Schedule, so as to affect its character as a building of special architectural or historic interest.
(2)Paragraph (a) of subsection (1) above shall only apply in relation to works for the permanent alteration or extension of a building specified in column (1) of Part II of Schedule 6 to this Act which affect its character as a building of special architectural or historic interest if the works are carried out for the purpose specified in relation to that building in column (2) of that Part.
(3)In this section“relevant building” means a building which was, on 1st February 1991, a listed building or in a conservation area; and expressions used in this section and in the Planning (Listed Buildings and Conservation Areas) Act 1990 have the same meaning in this section as in that Act.