The strength of the prosecution case is not relevant to the utilitarian value of a guilty plea; it is relevant only to the plea as evidence of contrition. Where accumulation of individual sentences each set at the 75% statutory non-parole period ratio produces an aggregate non-parole period exceeding that ratio, the accumulation itself may constitute 'special circumstances' warranting departure from the statutory ratio. Sentencing error in relation to a guilty plea discount does not automatically establish that a lesser sentence is warranted under s 6(3) of the Criminal Appeal Act.
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