Subject to paragraph (2), if the works are not completed within ten years from the coming into force of this Order or such extended time as the Secretary of State may, on the application of the Company, allow then, on the expiration of that period, or such extended time (as the case may be), the powers conferred by this Order to the Company for constructing the works shall cease except as to so much of them as is then substantially commenced.

Nothing in paragraph (1) shall apply to any works carried out under paragraph (3) of article 3 (power to construct, etc., works) or article 4 (subsidiary works), or to any maintenance dredging.