"In our judgment, the applicable principles are clear. Those who are under the age of 18 when they offend have long been treated by Parliament, and by the courts, differently from those who are adults. That is because of a recognition that, in general, children are less culpable, and less morally responsible, for their acts than adults. They require a different approach to sentencing and are not to be treated as if they were just cut-down versions of adult offenders ... There is, in our view, no reason why the distinction in levels of culpability should be lost merely because there has been an elapse of time which means that the offender is an adult when sentenced for offences committed as a child. Section 59(1) of the Sentencing Code requires every court, when sentencing or dealing with an offender who was under the age of 18 at the time of the offending, to follow the Children guideline except in the rare case when the court considers it would be contrary to the interests of justice to do so. Paragraphs 6.1 to 6.3 of that guideline are relevant in such circumstances, and we are unable to see any justification in logic or principle for the submission that those paragraphs should only be followed where the offender has only recently attained adulthood. They remain relevant, and therefore to be followed, however many years have elapsed between the offending and the sentencing. That is because the passage of time does not alter the fact of the offender's young age at the time of the offending. It does not increase the culpability which he bore at that time."
"A sentence is unduly lenient, we would hold, where it falls outside the range of sentences which the judge, applying his mind to all the relevant factors, could reasonably consider appropriate."
"Only if the court is satisfied that the offence crosses the custody threshold, and that no other sentence is appropriate, the court may, as a preliminary consideration, consult the equivalent adult guideline in order to decide upon the appropriate length of the sentence."
"While the seriousness of the offence will be the starting point, the approach to sentencing should be individualistic and focused on the child or young person, as opposed to offence focused."
"It is important to bear in mind any factors that may diminish the culpability of a child or young person. Children and young people are not fully developed and they have not attained full maturity. As such, this can impact on their decision making and risk taking behaviour. It is important to consider the extent to which the child or young person has been acting impulsively and whether their conduct has been affected by inexperience, emotional volatility or negative influences. They may not fully appreciate the effect their actions can have on other people and may not be capable of fully understanding the distress and pain they cause to the victims of their crimes."