(1)Where a person committed to prison or otherwise detained for failure to pay a fine imposed by a court of summary jurisdiction pays to the governor of the prison, under conditions prescribed by rules made under the [1952 c. 61.] Prisons (Scotland) Act 1952, any sum in part satisfaction of the fine, the term of imprisonment shall be reduced by a number of days bearing as nearly as possible the same proportion to the total number of days for which the prisoner is sentenced as the sum so paid bears to the total amount of the fine.
(2)In this section references to a prison and to the governor thereof shall include respectively references to any other place in which a person may be lawfully detained in default of payment of a fine, and to an officer in charge thereof.
(3)Provision may be made by Act of Adjournal for the application of sums paid under this section and for any matter incidental thereto.
(4)The provisions of Schedule 7 to this Act shall apply for the purposes of this section.