Detailed design
12.—(1) The authorised development must be designed in detail and carried out so that it is compatible with the preliminary scheme design shown on the works plans and the engineering section drawings, unless otherwise agreed in writing by the Secretary of State following consultation with the relevant planning authority and local highway authority on matters related to their functions and provided that the Secretary of State is satisfied that any amendments to the works plans and the engineering section drawings showing departures from the preliminary design would not give rise to any materially new or materially different environmental effects in comparison with those reported in the environmental statement.
(2) Where amended details are approved by the Secretary of State under sub-paragraph (1), those details are deemed to be substituted for the corresponding works plans or engineering section drawings and the undertaker must make those amended details available in electronic form for inspection by members of the public.