If the Minister is satisfied that the owners or occupiers of premises in any area outside the district of a local authority who supply water under this Act desire to obtain a supply of water from that authority, and that the giving of the supply is not likely to interfere with the supply of water for domestic or other purposes within the district of that authority, he may, on the application of that authority, and with the consent of the local authority within whose district, and of any statutory water undertakers within whose limits of supply, the area is situate, by order authorise the applicants to supply water in that area, or any part thereof, on such conditions as may be specified in the order:
Provided that consent shall not be unreasonably withheld, and any question whether or not consent is unreasonably withheld shall be referred to the Minister, whose decision shall be final.