A sentencing judge's misstatement of the standard non-parole period for an offence, being one of the two legislative guideposts, is a material error that vitiates the exercise of the sentencing discretion and requires the Court of Criminal Appeal to re-exercise the discretion afresh, even where the error relates to an indicative sentence within an aggregate sentence. The question whether a more confined approach to re-sentencing is available where the error only affects a discrete component of an aggregate sentence was expressly left open.
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