63.—(1) If any tidal work of which the undertaker is in possession in exercise of any of the powers conferred by this Order is abandoned or falls into decay, insofar as it affects or otherwise impacts upon the operation of Lowestoft Harbour or navigation in the approaches to Lowestoft Harbour, the harbour authority may by notice in writing require the undertaker to take such reasonable steps as may be specified in the notice either to repair or restore the work, or any part of it, or to remove the work and (to such extent as the harbour authority may reasonably requires) to restore the site to its former condition.
(2) If any tidal work is in such condition that it is, or is likely to become, a danger to or an interference with navigation, the harbour authority may by notice in writing require the undertaker to take such reasonable steps as may be specified in the notice—
(a)to repair and restore the work or part of it; or
(b)if the undertaker so elects, to remove the tidal work and (to such extent as the harbour authority reasonably requires) to restore the site to its former condition.
(3) If after such reasonable period as may be specified in a notice under this paragraph the undertaker has failed to begin taking steps to comply with the requirements of the notice, or after beginning to take such steps has failed to make reasonably expeditious progress towards effecting compliance with the requirements of the notice, the harbour authority may carry out the works specified in the notice and any expenditure reasonably incurred by it in so doing is recoverable from the undertaker.
(4) In the event of a difference or dispute between the undertaker and the harbour authority as to the necessity of any steps or works specified in a notice by the harbour authority under this paragraph, such difference or dispute must be determined by arbitration in accordance with article 62 (arbitration).