(1) No proceedings for an offence under this Act shall be instituted -
(a) in England or Wales, except by the Commissioner or by or with the consent of the Director of Public Prosecutions;
(b) in Northern Ireland, except by the Commissioner or by or with the consent of the Director of Public Prosecutions for Northern Ireland.
(2) A person guilty of an offence under any provision of this Act other than section 54A and paragraph 12 of Schedule 9 is liable -
(a) on summary conviction, to a fine not exceeding the statutory maximum, or
(b) on conviction on indictment, to a fine.
(3) A person guilty of an offence under section 54A and paragraph 12 of Schedule 9 is liable on summary conviction to a fine not exceeding level 5 on the standard scale.
(4) Subject to subsection (5), the court by or before which a person is convicted of -
(a) an offence under section 21(1), 22(6), 55 or 56,
(b) an offence under section 21(2) relating to processing which is assessable processing for the purpose