20. DLRL shall repay to the Board all fees, costs, charges and expenses reasonably incurred by the Board—
(a)in constructing any protective works under the provisions of paragraph 8(3)(a) including, in respect of any permanent protective works, a capitalised sum representing the cost of maintaining and renewing those works;
(b)in respect of the approval by the engineer of plans submitted by DLRL and the supervision by him of the construction or repair of any specified work and any protective work;
(c)in respect of the employment during the period of the initial construction of any specified work or protective work of any inspectors, watchmen and other persons whom it shall be reasonably necessary to appoint for inspecting, watching and lighting any part of the Dock and for preventing, so far as may be reasonably practicable, interference, obstruction, danger or accident arising from the construction or failure of the specified work or any protective work; and
(d)in bringing the specified work or any protective work to the notice of users of the Dock.