Are they a form of statute that get periodic parliamentary passage/assent? Or a form of secondary legislation? Or is the root of their forcefulness more in the authority of the courts under common law?
69 Criminal Procedure Rules
(1)There are to be rules of court (to be called “Criminal Procedure Rules”) governing the practice and procedure to be followed in the criminal courts.
(2)Criminal Procedure Rules are to be made by a committee known as the Criminal Procedure Rule Committee.
(3)The power to make Criminal Procedure Rules includes power to make different provision for different cases or different areas, including different provision—
(a)for a specified court or description of courts, or
(b)for specified descriptions of proceedings or a specified jurisdiction.
(4)Any power to make Criminal Procedure Rules is to be exercised with a view to securing that—
(a)the criminal justice system is accessible, fair and efficient, and
(b)the rules are both simple and simply expressed