Limits of deviation

4.—(1) The authorised development must be constructed, operated and maintained in the lines or situations shown on the works plans.

(2) Subject to Schedule 2 (requirements), in constructing, operating and maintaining the authorised development, the undertaker may—

(a) deviate laterally from the lines or situations shown on the works plans to the extent of the limits of deviation shown on the works plans; and

(b) deviate vertically from the levels shown on the works plans—

(i) to any extent upwards within the limits of deviation shown on the works plans; and

(ii) to any extent downwards as may be necessary, convenient or expedient.