=17.= The powers of the Court of Criminal Appeal under this Act to give leave to appeal, to extend the time within which notice of appeal or of an application for leave to appeal may be given, to assign legal aid to an appellant, to allow the appellant to be present at any proceedings in cases where he is not entitled to be present without leave, and to admit an appellant to bail, may be exercised by any judge of the Court of Criminal Appeal in the same manner as they may be exercised by the Court, and subject to the same provisions; but, if the judge refuses an application on the part of the appellant to exercise any such power in his favour, the appellant shall be entitled to have the application determined by the Court of Criminal Appeal as duly constituted for the hearing and determining of appeals under this Act. =18.= (1) Rules of court for the purposes of this Act shall be made, subject to the approval of the Lord Chancellor, and so far as the rules affect the governor or any other officer of a prison, or any officer having the custody of an appellant, subject to the approval also of the Secretary of State, by the Lord Chief Justice and the judges of the Court of Criminal Appeal, or any three of such judges, with the advice and assistance of the Committee hereinafter mentioned. Rules so made may make provision with respect to any matter for which provision is to be made under this Act by rules of court, and may regulate generally the practice and procedure under this Act, and the officers of any court before whom an appellant has been convicted, and the governor or other officers of any prison or other officer having the custody of an appellant and any other officers or persons, shall comply with any requirements of those rules so far as they affect those officers or persons, and compliance with those rules may be enforced by order of the Court of Criminal Appeal. (2) The committee hereinbefore referred to shall consist of a chairman of quarter sessions appointed by a Secretary of State, the Permanent Under Secretary of State for the time being for the Home Department, the Director of Public Prosecutions for the time being, the Registrar of the Court of Criminal Appeal, and a clerk of assize, and a clerk of the peace appointed by the Lord Chief Justice, and a solicitor appointed by the President of the Law Society for the time being, and a barrister appointed by the General Council of the Bar. The term of office of any person who is a member of the Committee by virtue of appointment shall be such as may be specified in the appointment.