4.—(1) This Act shall not apply to any warship or to any ship for the time being used by the government of any country for purposes other than commercial purposes.

(2) The Minister may, where he is satisfied that such an exemption would not result in an increased risk of pollution, by regulations exempt, subject to such conditions (if any) as may be specified in the regulations, any class or classes of ships registered in the State from compliance with any provision of this Act or of any regulations made thereunder.