Commentary First Group of Parts – Discipline Part 8 – Sentencing Powers and Mandatory Etc Sentences Section 221: Dangerous offenders aged under 18
447.Where section 219 would apply but for the offender being under 18, this section requires the court to pass a sentence of detention for life under section 209 if the conditions in section 226(2) of the 2003 Act (which determine when a civilian court would be required to pass such a sentence under section 91 of the Sentencing Act) are met. If they are not met, the court must pass a sentence of detention for public protection (another form of indeterminate sentence, defined by section 226(4) of the 2003 Act), unless the court considers that an extended sentence of detention under section 228 of the 2003 Act (as required by section 222) would be adequate for the protection of the public.