The Secretary of State may, after consultation with the Lord President and with the concurrence of the Treasury and the Civil Service Commissioners, make regulations prescribing the manner in which persons are to be admitted to any office the right of appointment to which is vested in the Secretary of State by this Part of this Act, and the conditions on which the said Commissioners may issue certificates in accordance with section eight of the [52 & 53 Vict. c. 54.] Clerks of Session (Scotland) Regulation Act, 1889, which section shall apply to any such office as aforesaid in like manner as it applies to the offices therein mentioned.