The local housing authority may by resolution—
exclude land from a general improvement area, or
declare that an area shall cease to be a general improvement area.
The resolution does not affect the continued operation of the provisions of this Part relating to general improvement areas, or any other provision so relating, in relation to works begun before the date on which the exclusion or cessation takes effect; but the resolution does apply with respect to works which have not been begun before that date, notwithstanding that expenditure in respect of the works has been approved before that date.