7.—(1) A tidal work shall not be constructed, altered, replaced, relaid or reconstructed except in accordance with plans and sections approved by the Minister and subject to any conditions and restrictions imposed by the Minister before the work is begun.
(2) If a tidal work is constructed, altered, replaced, relaid or reconstructed in contravention of this article or of any condition or restriction imposed under this article —
(a)the Minister 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 Minister may execute the works specified in the notice; or
(b)if it appears to the Minister 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 Minister in so doing shall be recoverable from the Commissioners.