(1) The Secretary of State shall exercise his powers under the provisions of this Act referred to in subsection (2) in such manner and to such extent as appears to him to be best calculated to promote the efficiency and effectiveness of the police.
(2) The provisions of this Act mentioned in subsection (1) are—
(a) Part I;
(b) this Part;
(c) Part III ...;
(d) in Chapter II of Part IV, sections 84 and 85 and Schedule 6; and
(e) in Part V, section 95.