4A control scheme may not be made with any modifications unless—
(a)every person served with a copy of the draft control scheme under paragraph 1 has been served with a notice of the proposal to make the modification, and
(b)every such person—
(i)has either consented to the proposal, or
(ii)has not, before the expiry of the period of 14 days beginning with the day of the service of the notice, notified the Scottish Ministers in writing that the person objects to it.