6.—(1) The Company may from time to time within the limits of deviation provide and operate such dock facilities, together with works ancillary to those facilities, as may be necessary or convenient for the construction of the work or the operation of the undertaking, and for this purpose the Company may construct and maintain roads, buildings, sheds, offices, workshops, depots, walls, foundations, fences, gates, tanks, pumps, conduits, pipes, drains, wires, mains, cables, electrical substations, signals, conveyors, cranes, container handling equipment, lifts, hoists, lighting columns, weighbridges, stairs, ladders, stages, platforms, catwalks, equipment, machinery and appliances and such other works and conveniences as may be necessary or expedient.
(2) Without prejudice to paragraph (1), the Company may within the limits of deviation carry out and maintain such other works as may be necessary or convenient for the purposes of, or in connection with or in consequence of, the construction, maintenance or use of the work including—
(a)works for the accommodation or convenience of vessels (including dolphins and pontoons); and
(b)works to alter the position of apparatus, including mains, sewers, drains, pipes, conduits, cables, electrical substations and electrical lines.
(3) Article 3 of, and Parts 11 and 17 in Schedule 2 to, the Town and Country Planning (General Permitted Development) Order 1995(1) (which respectively permit development authorised by a harbour revision order designating specifically both the nature of the development authorised and the land on which it may be carried out and development of operational land in respect of a dock or harbour undertaking) shall have effect in relation to a work as if the authority to develop given thereunder excluded buildings or any other structures or erections (including, without prejudice to the generality of the foregoing, stacks of goods, materials or shipping containers) above a height of 17 metres from ground level as shown on the deposited plans, other than the control tower, lights and lighting towers, cranes, trolleys, gantries, jibs or booms required for the construction of the work or the operation of the undertaking.