(1) Subject to article 5 of this Order, any fixed penalty may be paid in equal instalments of such sum, not exceeding, in any case, £20 as may be determined by the procurator fiscal and specified in the conditional offer.
(2) Each instalment shall become due for payment as follows:—
(a) on the fourteenth day after acceptance of the conditional offer by making payment of the first instalment in accordance with section 56 of the Act, the second instalment shall become due for payment; and
(b) each subsequent instalment shall become due for payment on the fourteenth day after the immediately preceding instalment became so due.
(3) Subject to paragraph (4), payment of each instalment shall be made on or before the day on which that instalment becomes due for payment in accordance with paragraph (2).
(4) Where the day on which any instalment becomes due for payment under paragraph (2) falls on a Saturday, Sunday or court holiday prescribed for the relevant court, payment of that instalment may be made on the next day which is not a Saturday, Sunday or such court holiday.