Subject to the provisions of this Part of this Act, to the provisions of any Order in Council made under this or any other Act of the appropriate Legislature enacted by virtue of powers conferred on that Legislature by this Act, the jurisdiction of and the law administered in, any existing High Court, and the respective powers of the judges thereof in relation to the administration of justice in the court, including any power to make rules of Court and to regulate the sittings of the Court and of members thereof sitting alone or in division courts, shall be the same as immediately before the commencement of Part III of this Act.