20.—(1) The Department may from time to time approve for the purposes of these Regulations (or withdraw its approval of) codes of practice issued for the purpose of giving practical guidance to persons engaged in any activity falling within regulation 5(2)(b) or 6(1)(c) about the steps they should take to prevent substances in list I from entering groundwater or to avoid pollution of such water by substances in list II.
(2) When the Department exercises its powers under paragraph (1) it shall make such arrangements as it considers appropriate for publicising its approval, or, as the case may be, its withdrawal.
(3) The Department shall make appropriate arrangements for bringing each code of practice for the time being approved under paragraph (1) to the attention of persons engaged in the relevant activity.