"Where an offender is convicted of a number of offences, one of which is subject to a mandatory minimum sentence, the principle of totality applies and requires the sentencing judge to consider whether the aggregate of consecutive sentences produces a total term which is disproportionate to the overall criminality of the offender's conduct, but the principle of totality should be applied in such a way that it does not undermine the will of Parliament by substantially reducing an otherwise appropriate consecutive sentence for another offence so as to render nugatory the effect of the mandatory minimum sentence."