Where sentences are partially accumulated and the sentencing judge does not expressly indicate an intention to depart from the statutory ratio for the overall sentence, a non-parole period exceeding three-quarters of the total sentence will be presumed to be arithmetic error or oversight. Standard non-parole periods under s 54A do not apply to offences committed before 1 February 2003, and having regard to them for such offences constitutes error by reference to an irrelevant consideration, though the error may not require intervention if the sentences are otherwise appropriate.
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