Where an offender is sentenced for offences committed while on parole, time served for breaches of parole is properly taken into account by deducting it from the unexpired balance of the original sentence (thereby reducing the head sentence), not by deducting it from the non-parole period fixed for the total period of imprisonment. To deduct from the non-parole period would negate the punishment for the parole breaches. Backdating the sentence to the date of parole cancellation would similarly result in impermissible double-counting.
The full text is available to signed-in members, including the 2 later cases that cite this judgment.