(1) At any time after a regional plan has become operative the regional planning council shall—
(a) maintain a constant examination of all factors likely to affect the regional plan and, where necessary, make appropriate proposals to the Minister for the alteration, repeal or replacement of the regional plan; and
(b) if so directed by the Minister, examine, within such period as may be fixed by the Minister, any proposal put forward by the Minister for the alteration, repeal or replacement of the regional plan.
(2) Sections six and seven shall apply, mutatis mutandis, to any proposal in terms of subsection (1) for the alteration, repeal or replacement of the regional plan.