"S 226 (1) This section applies where- (a) a person aged under 18 is convicted of a serious offence committed after the commencement of this section, and (b) the court is of the opinion that there is a significant risk to members of the public of serious harm occasioned by the commission by him of further specified offences." "
"(vi) It is still necessary, when sentencing young offenders, to bear in mind that, within a shorter time than adults, they may change and develop. This and their level of maturity may be highly pertinent when assessing what their future conduct may be and whether it may give rise to significant risk of serious harm." (vii) ... in relation to a particularly young offender an indeterminate sentence may be inappropriate even where a serious offence has been committed and there is a significant risk of serious harm from further offences: see for example Dean."