4If before the expiration of the said period of three months an objection is received by the Minister from any council on whom a notice is required to be served under this Schedule, or from any other person appearing to him to be affected by the order, and the objection is not withdrawn, the Minister shall cause a local inquiry to be held provided that except where the objection is made by any such council as aforesaid, the Minister may dispense with such an inquiry if he is satisfied that in the special circumstances of the case the holding of such an inquiry is unnecessary.