Where before the commencement of section 259A a local housing authority passed a resolution of any of the descriptions mentioned in the section expressed to have effect from a date after that on which it was passed—
Where the resolution declared a housing action area or general improvement area and, before the commencement of this section, the local housing authority passed a further resolution making the like declaration in relation to the whole or part of the area to which the first resolution then related—
The provisions of subsection (3) do not affect the powers of the Secretary of State under section 241(2)(a) and (b) (power to overrule declaration of housing action area or exclude land from area) and, so far as they relate to the duration of a housing action area, have effect subject to section 241(4) (effect of Secretary of State's decision in such a case).