8.—(1) A tidal work shall not be constructed, altered, enlarged, replaced, relaid, extended or reconstructed except in accordance with plans and sections approved by the Secretary of State and subject to any conditions and restrictions imposed by the Secretary of State before the work is begun.
(2) If a tidal work is constructed, altered, enlarged, replaced, relaid, extended or reconstructed in contravention of this article or of any condition or restriction imposed under this article—
(a)the Secretary of State may by notice in writing require the Commissioners at their own expense to remove the tidal work or any part thereof and restore the site thereof to its former condition; and, if on the expiration of 30 days from the date when the notice is served upon the Commissioners they have failed to comply with the requirements of the notice, the Secretary of State may execute the works specified in the notice; or
(b)if it appears to the Secretary of State urgently necessary so to do, he may remove the tidal work or part of it and restore the site to its former condition;
and any expenditure incurred by the Secretary of State in so doing shall be recoverable from the Commissioners.