Where under any enactment a court of summary jurisdiction has power to order a person to be imprisoned in respect of the non-payment of a fine, or of the default of a sufficient distress to satisfy the amount of that fine, for a term in addition and succession to a term of imprisonment imposed for the same offence as the fine, then, in relation to a sentence for an offence under this Act, the aggregate of those terms of imprisonment may, notwithstanding anything in any such enactment, be any period not exceeding fifteen months.