5.—(1) Not less than 56 days before commencing the construction or maintenance of any specified work the Harbour Authority shall submit to the undertaker a plan, section and description of the works to be executed.
(2) The Harbour Authority shall not commence the construction or maintenance of any specified work until the undertaker has given written approval of the plan, section and description so submitted.
(3) Any approval of the undertaker required under sub-paragraph (2)—
(a)may be given subject to reasonable conditions for the alteration or otherwise for the protection of the apparatus, or for securing access to the apparatus, and the undertaker shall be entitled by its officer to watch and inspect the execution of those works;
(b)shall not be unreasonably withheld; and
(c)shall be deemed to have been given if it is neither given nor refused within 28 days of the submission of plans for approval.
(4) If the undertaker in accordance with sub-paragraph (3) and in consequence of the works proposed by the Harbour Authority, reasonably requires the removal of any apparatus and gives written notice to the Harbour Authority of that requirement, the foregoing provisions of this Schedule shall apply as if the removal of the apparatus had been required by the Harbour Authority under paragraph 3.
(5) Nothing in this paragraph shall preclude the Harbour Authority from submitting at any time or from time to time, but in no case less than 56 days before commencing the execution of any works, a new plan, section and description in lieu of the plan, section and description previously submitted, following which the provisions of this paragraph shall apply to and in respect of the new plan, section and description.
(6) The Harbour Authority shall not be required to comply with sub-paragraph (1) in a case of emergency but in that case it shall give to the undertaker as much prior notice as is reasonably practicable and a plan, section and description of those works as soon as reasonably practicable afterwards and shall comply with sub-paragraph (2) in so far as is reasonably practicable in the circumstances.