If the works are not substantially completed within 10 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 expiry of that period, or such extended time (as the case may be), the powers by this Order granted to the Company for constructing and maintaining the works will cease to have effect except as to so much of them as is then substantially commenced.

Nothing in paragraph (1) affects the carrying out of the works under paragraph (2) of article 3 (power to construct and maintain works) or article 5 (subsidiary works).