4If no objection to a compulsory purchase order is duly made by any of the persons upon whom notices are required by the last foregoing paragraph to be served, or if all such objections so made are withdrawn, the Minister may, if he thinks fit, confirm the order with or without modification, but in any other case he shall, before confirming the order, cause a local inquiry to be held and consider any objection not withdrawn and the report of the person who held the inquiry, and may then confirm the order with or without modification :
Provided that—
(a)the Minister may require any person who made an objection to state in writing the grounds thereof, and may confirm the order without causing a local inquiry to be held, if he is satisfied that every objection duly made relates exclusively to matters which can be dealt with by the arbitrator by whom the compensation is to be assessed; and
(b)the order as confirmed by the Minister shall not, unless all persons interested consent, authorise the local authority to purchase any land which the order would not have authorised them to purchase if it had been confirmed without modification.