9Investigation of complaints
(1)There shall be a Tribunal for the purpose of investigating complaints about the Intelligence Service or GCHQ in the manner specified in Schedule 1 to this Act.
(2)The Commissioner shall have the functions conferred on him by Schedule 1 to this Act and give the Tribunal all such assistance in discharging their functions under that Schedule as they may require.
(3)Schedule 2 to this Act shall have effect with respect to the constitution, procedure and other matters relating to the Tribunal.
(4)The decisions of the Tribunal and the Commissioner under Schedule 1 to this Act (including decisions as to their jurisdictions) shall not be subject to appeal or liable to be questioned in any court.