15(1)Where any authorised development consists of or includes the carrying out on any working site within the limits of land to be acquired of operations ancillary to the construction of the tunnel system—U.K.
(a)those operations shall be discontinued before the end of the relevant period; and
(b)the Concessionaires shall, in accordance with a scheme agreed with the district planning authority or, in default of agreement or on notice being given by the Secretary of State to the authority and the Concessionaires, settled by him, put the site, except any part which is required either for use for or in connection with the operation of the tunnel system or for any of the Railways Board’s works, into such a condition as the scheme may provide.
(2)The relevant period is the period of ten years beginning with the date of the passing of this Act or such longer period as the Secretary of State may specify, after consultation with the district planning authority, at any time before the end of the period of ten years or of any period previously specified by him.
16U.K.Where any development to which any planning permission granted by virtue of section 9(4) of this Act relates consists of or includes the carrying out on any working site within the limits of land to be acquired of operations ancillary to any of the Railways Board’s works—
(a)those operations shall be discontinued before the end of the period of ten years beginning with the date of the passing of this Act; and
(b)the Railways Board shall, in accordance with a scheme agreed, in the case of a working site in a London borough, with the borough planning authority and, in the case of a working site anywhere else, by the district planning authority or, in default of agreement or on notice being given by the Secretary of State to the authority and the Railways Board, settled by him, put the site, except any part which is required for any of the Railways Board’s works, into such a condition as the scheme may provide.