Not read it in detail, but I think its in section 100:
Commencement
(1) Subject to subsection (2), this Act comes into force on such day or days as the Secretary of State may by regulations appoint.
(2) This section and the following provisions come into force on the day on which this Act is passed—
(a) Part 1 (and Schedule 1);
(b) Part 2 (and Schedules 2 and 3);
(c) paragraph 7 of Schedule 5 (and section 20 so far as relating to that paragraph);
(d) sections 88 and 90 to 94 (and Schedule 11);
(e) paragraphs 1 to 4 and 9 of Schedule 12 (and section 98(1) so far as relating to those paragraphs);
(f) sections 99 and 101;
(g) any other provision of this Act so far as it— (i) confers power to make regulations, (ii) imposes a duty or confers power to make rules, or (iii) is otherwise necessary for enabling the exercise of a duty or power within sub-paragraph (i) or (ii) on or after the day on which this Act is passed.
(3) Regulations under subsection (1) may appoint different days for different purposes.
(4) The Secretary of State may by regulations make transitional, transitory or saving provision in connection with the coming into force of any provision of this Act.
(5) Regulations under subsection (4) may make different provision for different purposes. (6) Regulations under this section are to be made by statutory instrument.
Section 91 is the bit which requires that regulations under the Act must be made by a statutory instrument in Parliament. So it looks as if some sections of the Act may not come into force until further regulations have been made via a stat instrument passed by Parliament.