When any such order has been approved by the Minister, the local authority shall give notice of the order by advertisement in a local newspaper circulating in the district and in such other manner as they think sufficient for informing persons interested, and shall also send a copy to each registered medical practitioner who after due inquiry is ascertained to be practising in their district, and the order shall come into operation on such date, not being earlier than one week after the date of the publication of the advertisement of the order in a local newspaper, as the local authority may fix.
An order made under this section may be varied or revoked by an order made and approved in like manner as the original order.