Where an order is made under subsection (1) of section 149 of the Local Government, Planning and Land Act 1980 (urban development corporation as planning authority), the urban development corporation specified in the order shall be the local planning authority for such area as may be so specified in place of any authority who would otherwise be the local planning authority for that area for such purposes and in relation to such kinds of development as may be so specified.
Where an order under subsection (3)(a) of that section confers any functions on an urban development corporation in relation to any area the corporation shall have those functions in place of any authority (except the Secretary of State) who would otherwise have them in that area.