`(1) It shall be the duty of each relevant authority to integrate requirements for environmental protection wherever applicable into its policies and plans and into the performance of its functions under any enactment.
(2) For the purpose of this section "relevant authority" means—
(a) any Minister of the Crown;
(b) any public body,
(c) any statutory undertaker; or
(d) any person holding public office.'.—[Ms Ruddock]