Where partial accumulation of sentences produces a grossly distorted overall ratio between total non-parole period and total head sentence (here approximately 83%), this constitutes sentencing error regardless of whether the distortion was intended or the result of oversight. The appropriate remedy may be to adjust the commencement date of the later sentence rather than altering its length or internal ratio. The interests of the community in supervision, reintegration and rehabilitation of the offender are relevant considerations alongside the offender's individual circumstances, particularly where the offender has an intellectual disability.
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