Subsection (1) gives effect to Schedule 12, Part I of which makes consequential amendments in connection with the pension sharing provisions in Parts III and IV of the Act.
Subsection (2) provides regulation-making powers to enable the Secretary of State to amend or revoke any instrument made under an Act as he thinks necessary or expedient as a consequence of the coming into force of any provisions specified in subsection (4).
Subsection (3) provides a power to enable the Secretary of State to make by regulations the kind of provision that can be included in a commencement order.
For fuller details on the pension sharing measures, see the commentary on Parts III and IV.
Commentary Commentary Part VI: General Section 84 Consequential amendments etc.