[30] That this is so can be illustrated, I think, by assuming a notional head sentence of nine years imprisonment. If one were then to reduce it by one-third, one would reach a level of head sentence which could be further moderated having regard to the applicant's cooperation with the authorities and other mitigating factors such as the applicant's mental health problems. The applicant, by virtue of his psychiatric difficulties, is not a suitable candidate for a suspended sentence: a period of parole is obviously important for the applicant's rehabilitation. Any further moderation of the sentence could therefore only include a provision for early consideration for parole. Without any such recommendation, the applicant would become eligible for consideration for parole after serving three years of his sentence. In moderating the sentence by reference to eligibility for consideration for parole, the sentencing court would need to balance the desirability of giving the applicant a real incentive to continue his cooperation with the public interest in proper punishment of the applicant's criminal conduct. A recommendation that the applicant be eligible for consideration for parole after two and a half years further moderates the applicant's head sentence in a substantial way and gives the applicant incentive to continue his cooperation with the authorities, while at the same time making it clear that the serious criminality of the applicant's involvement in cocaine distribution is such as to attract a substantial period in actual custody.