Commencement
105.Section 19 deals with commencement. Certain supplementary provisions (the interpretation section (section 16), the section relating to Northern Ireland (section 17) and sections 18 to 20 come into effect on Royal Assent. Otherwise there is a power for the Secretary of State to bring the provisions of the Act into force on such day as the Secretary of State may by order appoint.  Different days may be appointed for different purposes.