Sentencing an offender whose parole has been cancelled is one of the most difficult tasks which can confront a sentencing judge. The judge is obliged to apply simultaneously a number of different rules, some derived from statute and others from common law, as follows:
(a) The prohibition on speculation
Parole having been cancelled on account of the later offences, the court in sentencing the offender for those offences must assume - when applying the principle of totality - that the offender will be required to serve the full parole sentence. This is because s 5(2AA)(a) imposes an absolute prohibition on the court speculating on action which the Parole Board might in the future take. Specifically, the court must ignore altogether the possibility that the Parole Board will decide to re-release the offender on parole before the full parole sentence has been served.
(b) The presumption of cumulation (s 16(3B))
By force of statute, the sentence imposed for the later offences must be served cumulatively on the parole sentence, unless otherwise directed by the court because of the existence of exceptional circumstances.
(c) The principle of totality
In fixing the sentence for the later offences, the court must take into account that the parole sentence will be served cumulatively. Viewed as a whole, the aggregate of sentences imposed by reason of cumulation cannot be greater than is warranted by the totality of the criminality represented by both the later offences and the original offences.
(d) Parole breach as an aggravating factor
On ordinary principles, the fact that the later offences were committed while the offender was on parole aggravates the seriousness of those offences.[23]