The Agricultural Marketing (Public Inquiry) Rules 1949

5.  An inquiry into objections to a scheme, other than those which the Minister considers to be frivolous, shall be held at such time and place as may be fixed by the appointed person with the approval of the Minister. Not less than 21 days' notice of the time and place so fixed shall be sent by post by or on behalf of the appointed person to—

(i) the persons who are nominated at the time of the submission of the scheme for the purpose of receiving notice of any modifications of the scheme proposed to be made by the Minister or, in the case of an amendment to a scheme, the board administering that scheme; and

(ii) all persons by whom objections to the scheme have been duly made other than persons whose objections the Minister considers to be frivolous;

and notice shall also be published in such manner as the appointed person thinks best suited for bringing the holding of the inquiry to the knowledge of any other persons who appear to him to be interested:

Provided that the failure to give or publish any such notice shall not invalidate the inquiry or render necessary any adjournment thereof.