7. If the responsible authority considers that the printing and sale in accordance with the requirements of subsection (1) of Section 2 of the Principal Act of any schedule or other document which is identified by or referred to in a statutory instrument and would, but for the provisions of this Regulation, be required to be included in the instrument as so printed and sold, is unnecessary or undesirable having regard to the nature or bulk of the document and to any other steps taken or to be taken for bringing its substance to the notice of the public, he may, on sending it to the King's printer of Acts of Parliament, certify accordingly; and any instrument so certified shall, unless the Reference Committee otherwise direct under these Regulations, be exempt from the requirements aforesaid so far as concerns the document specified in the certificate.