A total sentencing discount of 46.6% for guilty pleas and substantial assistance to authorities (including against corrupt police) was upheld where the offender was convicted of supplying a large commercial quantity of heroin. The s 23(3) proportionality limitation operates as an independent constraint: even if the discount calculation is erroneous, the Court of Criminal Appeal will not intervene under s 6(3) if a more lenient sentence would be unreasonably disproportionate to the offences.
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