The following provisions of the [1967 c. 13.] Parliamentary Commissioner Act 1967 shall, with any necessary modifications, apply to the Commissioner, his officers and to a body subject to investigation as they apply to the Commissioner under that Act, his officers and to a department or authority concerned—
(1)section 7 (procedure in respect of investigations);
(2)section 8 (evidence), except subsection (4);
(3)section 9 (obstruction and contempt);
(4)section 11 (secrecy of information), except subsection (4).