6Subject to paragraph 8, on the adoption or approval of a local plan under section 43 or 45 or paragraph 10 of Part II of this Schedule so much of any old development plan as relates to the area to which the local plan relates shall cease to have effect.
7The Secretary of State may by order direct that any of the provisions of the old development plan shall continue in force in relation to the area to which the local plan relates.
8If the Secretary of State makes an order under paragraph 7, the provisions of the old development plan specified in the order shall continue in force to the extent so specified.
9Subject to paragraph 10, the Secretary of State may by order wholly or partly revoke a development plan continued in force under this Schedule whether in its application to the whole of the area of a local planning authority or in its application to part of that area and make such consequential amendments to the plan as appear to him to be necessary or expedient.
10Before making an order with respect to a development plan under paragraph 7 or 9, the Secretary of State shall consult with the local planning authority for the area to which the plan relates.