“139. Powers and duties of Crown Court in relation to fines and forfeited recognizances. (1) Subject to the provisions of this section, if the Crown Court imposes a fine on any person or forfeits his recognizance, the court may make an order - (a) allowing time for the payment of the amount of the fine or the amount due under the recognizance; (b) directing payment of that amount by instalments of such amounts and on such dates as may be specified in the order; (c) [applicable only to recognizances] (2) Subject to the provisions of this section, if the Crown Court imposes a fine on any person or forfeits his recognizance, the court shall make an order fixing a term of imprisonment or of detention under section 108 above (detention of persons aged 18 to 20 for default) which he is to undergo if any sum which he is liable to pay is not duly paid or recovered. … 140. Enforcement of fines imposed and recognizances forfeited by Crown Court. (1) Subject to subsection (5) below, a fine imposed or a recognizance forfeited by the Crown Court shall be treated for the purposes of collection, enforcement and remission of the fine or other sum as having been imposed or forfeited - (a) by a magistrates’ court specified in an order made by the Crown Court, or (b) if no such order is made, by the magistrates’ court by which the offender was committed to the Crown Court to be tried or dealt with or by which he was sent to the Crown Court for trial under section 51 or 51A of theCrime and Disorder Act 1998 , and, in the case of a fine, as having been so imposed on conviction by the magistrates’ court in question. (2) Subsection (3) below applies where a magistrates’ court issues a warrant of commitment on a default in the payment of - (a) a fine imposed by the Crown Court; or (b) a sum due under a recognizance forfeited by the Crown Court. (3) In such a case, the term of imprisonment or detention under section 108 above specified in the warrant of commitment as the term which the offender is liable to serve shall be - (a) the term fixed by the Crown Court under section 139(2) above, or (b) if that term has been reduced undersection 79(2) of the Magistrates’ Courts Act 1980 (part payment) or section 85(2) of that Act (remission), that term as so reduced, notwithstanding that that term exceeds the period applicable to the case undersection 149(1) of the Customs and Excise Management Act 1979 (maximum periods of imprisonment in default of payment of certain fines).”
“79. Release from custody and reduction of detention on payment. (1) Where imprisonment or other detention has been imposed on any person by the order of a magistrates’ court in default of payment of any sum adjudged to be paid by the conviction or order of a magistrates’ court or for want of sufficient distress to satisfy such a sum, then, on the payment of the sum, together with the costs and charges, if any, of the commitment and distress, the order shall cease to have effect; and if the person has been committed to custody he shall be released unless he is in custody for some other cause. (2) Where, after a period of imprisonment or other detention has been imposed on any person in default of payment of any sum adjudged to be paid by the conviction or order of a magistrates’ court or for want of sufficient distress to satisfy such a sum, payment is made in accordance with rules of court of part of the sum, the period of detention shall be reduced by such number of days as bears to the total number of days in that period less one day the same proportion as the amount so paid bears to so much of the said sum, and the costs and charges of any distress levied to satisfy that sum, as was due at the time the period of detention was imposed. (3) In calculating the reduction required under subsection (2) above any fraction of a day shall be left out of account.”
“‘impose imprisonment’ means pass a sentence of imprisonment or fix a term of imprisonment for failure to pay any sum of money, or for want of sufficient distress to satisfy any sum of money, or for failure to do or abstain from doing anything required to be done or left undone.”