20.—(1) Subject to sub-paragraph (2), any specified work, and all protective works required by the consenting authority under paragraph 19, shall be constructed—
(a)in accordance with the plans approved or deemed to have been approved under this Schedule; and
(b)the consenting authority shall be entitled by its officer to watch and inspect the construction of such works.
(2) The undertaker shall give to the consenting authority not less than 14 days’ notice in writing of its intention to commence construction of any specified work and notice in writing of its completion not later than 7 days after the date on which it is completed.
(3) If the consenting authority shall reasonably require, the undertaker shall construct all or part of the protective works so that they are in place prior to the construction of any specific work.
(4) If any part of a specified work or any protective work required by the consenting authority is constructed otherwise than in accordance with the requirements of this Schedule, the consenting authority may by notice in writing require the undertaker at the undertaker’s own expense to comply with the requirements of this part of this Schedule or (if the undertaker so elects and the consenting authority in writing consents, such consent not to be unreasonably withheld or delayed) to remove, alter or pull down the work and, where removal is required, to restore the site to its former condition to such extent and within such limits as the consenting authority reasonably requires.
(5) Subject to sub-paragraph (6), if within a reasonable period, being not less than 28 days from the date when a notice under sub-paragraph (4) is served upon the undertaker, it has failed to begin taking steps to comply with the requirements of the notice and subsequently to make reasonably expeditious progress towards their implementation, the consenting authority may execute the works specified in the notice and any expenditure incurred by it in so doing shall be recoverable from the undertaker.
(6) In the event of any dispute as to whether sub-paragraph (4) is properly applicable to any work in respect of which notice has been served under that sub-paragraph, or as to the reasonableness of any requirement of such a notice, the consenting authority shall not, except in emergency, exercise the powers conferred by sub-paragraph (5) until the dispute has been finally determined.