6.—(1) In constructing or maintaining any of the scheduled works, the promoter may—
(a)deviate laterally from the lines or situations shown on the works and land plan to the extent of the limits of deviation for that work; and
(b)deviate vertically from the levels shown on the sections—
(i)to any extent not exceeding 3 metres upwards; or
(ii)to any extent downwards as may be found to be necessary or convenient.
(2) Without limitation on the scope of paragraph (1), in constructing and maintaining the scheduled works the promoter may within the limits of deviation deviate laterally from their points of commencement and termination shown on the works and land plans.