The preceding provisions of this Act come into force in accordance with provision made by order by the Secretary of State.

An order bringing into force paragraph (d) of section 2(1) is subject to affirmative resolution procedure.

Section 1 does not apply in relation to anything done or omitted before the commencement of that section.

Section 20 does not affect any liability, investigation, legal proceeding or penalty for or in respect of an offence committed wholly or partly before the commencement of that section.

For the purposes of subsection (4) an offence is committed wholly or partly before the commencement of section 20 if any of the conduct or events alleged to constitute the offence occurred before that commencement.