Commentary First Group of Parts – Discipline Part 8 – Sentencing Powers and Mandatory Etc Sentences Section 222: Offenders aged under 18: certain violent or sexual offences
448.Where section 220 would apply but for the offender being under 18, or section 221 applies but the court does not think that a sentence of detention for public protection is necessary, this section requires the court to pass an extended sentence of detention. This sentence is defined by section 228 of the 2003 Act. It consists of an appropriate custodial term of at least 12 months, plus an extension period (of up to 5 years in the case of a violent offence, or 8 years in the case of a sexual offence) during which the offender is on licence.