(1) An amendment made by any of sections 1, 2, 3, 5 or 6 applies only in a case where every act or other event proof of which is required for conviction of the offence in question takes place on or after the day on which the amendment comes into force.

(2) An amendment made by section 7 applies only in relation to an offence committed on or after the day on which the amendment comes into force.

(3) Except as otherwise provided by subsection (4), an amendment made by section 9 or 10, or by Part 1 of Schedule 4, applies in relation to a person sentenced for an offence on or after the day on which the amendment comes into force, whether the offence was committed before that day or on or after it.

(4) The amendments made by section 9 and Part 1 of Schedule 4, so far as they have effect for the purposes of the following provisions, apply only in relation to a person sentenced for an offence committed on or after the day on which they come into force -

(a) sections 225(1)(a) and 226(1)(a) of the Criminal Justice Act 2003, and

(b) sections 219(1)(b) and 221(1)(b) of the Armed Forces Act 2006.