51.—(1) For the purpose of giving guidance on appropriate methods (including the use of specified types of plant or machinery) for minimising noise the Department may by order—
(a)prepare and approve and issue such codes of practice as in the opinion of the Department are suitable for the purpose; and
(b)approve such codes of practice issued or proposed to be issued otherwise than by the Department as in the opinion of the Department are suitable for the purpose.
(2) The Department shall by order under paragraph (1)( a) or ( b) approve a code of practice for the carrying out of works to which Article 40 applies.