22.—(1) The Harbour Authority shall pay to the PLA for material dredged by the Harbour Authority under this Order from so much of the river as is vested in the PLA consideration calculated at a rate agreed between them and otherwise in accordance with this paragraph.
(2) The Harbour Authority shall pay consideration under sub-paragraph (1) as respects material dredged in the course of the construction of the works authorised by article 13 (power to dredge) based on the quantity of such material that—
(a)is not used for the construction of—
(i)the authorised works;
(ii)any other works related to the construction of London Gateway Port; or
(iii)the related development; and
(b)is sold by the Harbour Authority or by any other person exercising any powers under this Order.