8. Except with the consent of Trinity House, which consent shall not be unreasonably withheld—
(a)no works shall be carried out within the Trinity Pier protected area under article 3 or article 5; and
(b)no dredging operations shall be carried out within the Trinity Pier protected area under this Order and no such operations shall be permitted which involve dredging to any depth lower than the inclined plane within that area which is 4.5 metres below Chart Datum at the side of the area nearest to the pier and 8 metres below Chart Datum at the side of the area furthest from the pier.