4.—(1) A person convicted of an offence for which a penalty is provided in any enactment indicated in the First Schedule to this Act at any reference number shall, in lieu of the fine provided in that enactment, be liable to the fine specified in column (3) of that Schedule at that reference number, and that enactment shall be construed and have effect accordingly.

(2) Where it is provided in the First Schedule to this Act at any reference number that a person shall be liable to a daily default fine, he shall be guilty of contravening the relevant enactment on every day on which the contravention continues after conviction of the original contravention and for each such offence he shall be liable to a fine not exceeding the amount specified at that reference number instead of the fine specified for the original contravention.

(3) The provisions of this section shall not apply to any offence committed before the passing of this Act.