96 In R v AJP (2004) 150 A Crim R 575, Simpson J provided the following helpful summary of the principles to be applied:
(i) while s54B(2) requires, in sentencing in respect of an offence to which Division 1A applies, unless the sentencing court determines that there are reasons not to do so, that it set the standard non-parole period as the non-parole period for the offence, that obligation exists where the offence in question is an offence in the middle of the range of objective seriousness of offences of that kind; one reason permitting departure from the standard non-parole period is that the offence in question falls outside the middle of that range (para [67]);
(ii) the standard non-parole period was intended for a middle range case where the offender is convicted after trial: a plea of guilty might be in itself a reason for departure from the standard non-parole period (para [68]);
(iii) a sentencing judge will be required, in relation to any given case, to hypothesise what is an abstract offence in the middle of the range of objective seriousness in order to determine where the subject offence lies in relation to such an offence; such an exercise is, in reality, little different from the traditional sentencing exercise of evaluating objective seriousness of any offence, and should be approached intuitively and based upon the general experience of courts in sentencing for the particular offence (paras [74] - [77]);
(iv) circumstances that affect the evaluation of the objective seriousness of any offence include (but are not necessarily limited to) the actus reus , the consequences of the conduct, such factors as impinge upon the mens rea of the offender, matters of motivation, mental state, mental illness or disability (where causally related to the commission of the offence). Factors that affect the circumstances of the offender as distinct from the offence (for example, youth or prior sexual abuse) do not affect the evaluation of objective seriousness (paras [85] - [86]);
(v) that an offence is "typical" or "common" does not dictate that it is in the middle of the range of objective seriousness (para [101]);
(vi) the numerical frequency with which an offence of a particular kind is committed is not an indicator of the objective seriousness of any individual instance of that offence: (paras [101] - [102]);
(vii) where a court determines that there are reasons for departing from the standard non-parole period, the standard non-parole period nevertheless remains of relevance in the sentencing determination, as a reference point, benchmark, sounding board or guidepost (para [122]); see also R v GJ Davies [2004] NSWCCA 319. (par 13)