The preceding provisions of this Act shall come into force on such day as the Secretary of State may by order made by statutory instrument appoint.

Subject to subsection (3), different days may be appointed under this section for different purposes.

The power under this section to appoint a day for the coming into force of the provisions of sections 1 and 2 shall not authorise the appointment for those purposes of any day before the issue of the code of practice that must be issued under section 3.