Six other gang members are to be detained for up to 16 years at young offenders' institutions (YOI).

BBC: Croxteth Young Guns gang leader jailed for 20 years

Inspectors found Hindley Young Offenders Institution (YOI), near Wigan, Greater Manchester, was doing some good work to help inmates.

BBC: Hindley corridor

He was sentenced for a crime, which has not been revealed to the inquest, in December 2009, and entered Aylesbury YOI in July 2010.

BBC: Aylesbury Young Offender Billy Spiller 'like a tornado'