5(1)Where the Commissioners and the Authority submit joint proposals to the Secretary of State for the variation of the boundary between the navigation area and the Haven, he may by order vary that boundary in accordance with the proposals.
(2)Where the Secretary of State makes an order under sub-paragraph (1) above, the area of the Haven shall, for the purpose of distinguishing between the functions of the Authority and those of the Commissioners, and while the variation remains in force, be treated as varied in accordance with the order.
(3)The power conferred on the Secretary of State by this paragraph shall not be exercisable after the end of the period of three years beginning with the date on which section 8 of this Act comes into force.
(4)Before submitting any proposal under this paragraph, the Authority shall consult the Navigation Committee.