An early plea of guilty does not automatically attract a 25 per cent discount; the guideline range from Thomson and Houlton is 10 to 25 per cent depending on the circumstances. The parity principle requires an objective assessment of whether a reasonable person would regard the grievance as justified, and differences in maximum penalties, conditions of liberty at the time of offending, and subsequent increases in a co-offender's sentence on appeal are all relevant to that assessment.
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