Consideration
41Given the summary of the offending conduct, it could not be gainsaid that the objective seriousness of the offending of each of the applicant and the principal co-offender called for stern and condign punishment regardless of their subjective circumstances. To put it another way, the necessity for "reasonable proportionality between a sentence and the circumstances of the crime", whatever the strength of the subjective case of the offenders, required stern punishment: R v Geddes (1936) 36 SR (NSW) 554 at 556; R v Dodd (1991) 57 A Crim R 349 at 354.
42In view of the concession made by the Crown, it is necessary that leave to appeal be granted, that the appeal be allowed (at least in part) and that this Court proceed to re-sentence the applicant, so as to take account of the sentencing judge's mathematical error. The question remains, however, whether the applicant has made out any of his grounds of appeal and, if so, what effect, if any, that will have on the sentence that ought to be imposed.
43Ground 1A was directed to the parity principle. The parity principle is an aspect of equal justice: Green v R; Quinn v R [2011] HCA 49; 244 CLR 462 at 472 [28]; 474 [31]; 476 [33] per French CJ, Crennan and Kiefel JJ. In Lowe v The Queen [1984] HCA 46; 154 CLR 606 at 610 Gibbs CJ said:
"The reason why the court interferes in such a case is that it considers that the disparity is such to give rise to a justifiable sense of grievance, or in other words to give the appearance that justice has not been done."
44In Green and Quinn, the plurality, having cited this passage, added:
"The sense of grievance necessary to attract appellate intervention with respect to disparate sentences is to be assessed by objective criteria. The application of the parity principle does not involve a judgment about the feelings of the person complaining of disparity. The court will refuse to intervene where disparity is justified by differences between co-offenders such as age, background, criminal history, general character and the part each has played in the relevant criminal conduct or enterprise." (Citations omitted).
45The parity principle is one of the pillars underpinning sentencing law: Muldrock v The Queen [2011] HCA 39; 244 CLR 120 at 128 [18]. These pillars support the whole sentencing task. To put it another way, the principles permeate the whole process. As the Court put it in Muldrock, at 128 [17]:
"It ... remains, essential to recognise, however, that the fixing of a non-parole period is but one part of the larger task of passing an appropriate sentence upon the particular offender. Fixing the appropriate non-parole period is not to be treated as if it were the necessary starting point or the only important end-point in framing a sentence ..."
46The non-parole period represents the minimum period which the sentencing court adjudges that justice requires an offender to spend in gaol for his or her other offending. But, subject, importantly, to the Crimes (Sentencing Procedure) Act, s 44, the length of the non-parole period may be fixed by reference to subjective factors of a kind that may justify disparity between sentences imposed upon offenders who committed the same offence. Nonetheless, all other things being equal, disparity in the non-parole period, or indeed, in the relationship between the non-parole period and the total effective term, may give rise to the requisite justifiable sense of grievance, such as to call for appellate intervention. General sentencing principles guide all relevant steps in the sentencing process: R v Hampton (1998) 44 NSWLR 729 at 732.
47Reading the sentencing judge's reasons as a whole, it appears that in general terms his Honour intended to treat the applicant and the principal co-offender more or less equally, notwithstanding the language highlighted by the Crown as suggesting reasons for a slightly lower sentence for the principal co-offender. His Honour was well aware, and stressed, that the applicant's subjective case in the ordinary course entitled him to somewhat more leniency than the principal co-offender. What made a difference to this assessment was the additional discount to which the principal co-offender was entitled for his assistance. Reading the reasons as a whole, it appears that this factor, not present in the applicant's case, brought the sentence imposed upon the principal co-offender into parity with the sentence imposed upon the applicant.
48For that reason, the Court has concluded that his Honour did not intend to differentiate between the applicant and the principal co-offender so as to fix a total non-parole period that was 60 per cent of the total effective sentence in the case of the principal co-offender and 62.5 per cent of the total effective sentence in the case of the applicant. Rather, we consider that his Honour intended that each of them was to have the opportunity of spending 6 years on parole. This explains the non-parole period of 9 years fixed against a total sentence of 15 years in the case of the main co-offender, and the 10 year non-parole period fixed against a total of 16 years pronounced in the case of the applicant. To work on the basis of a 2.5 per cent difference imbues the exercise with an artificial air of precision which should be eschewed. We would add that the finding of special circumstances in the case of the principal co-offender was, in the Court's view, a most favourable one. However, there is no appeal against that finding so that the Court is obliged to act upon the sentence that was imposed. That sentence was not one which could be characterised as so inadequate so as not to be an appropriate comparator for the purposes of these principles: see Green and Quinn especially at [33].
49Accordingly, the applicant has established error in respect of this ground of appeal, although the error is essentially a function of his Honour's mathematical error.