Levels of violence in young offender institutions have been described as unacceptably high, with inmates and staff facing the daily threat of beatings and stabbings. The government is promising a thorough review of the system. But what's life like for young people who get locked up? "Fights happened from day to day, any time of the day," says Stephen Knight. "From silly little things like tobacco being stolen or towels being misplaced, simple little petty things caused inmates to have fights all the time."Mr Knight was one of 1,500 people imprisoned for their part in the rioting in English cities during the summer of 2011.Aged 17, he was sent to Feltham Young Offender Institution, in west London, notorious for its levels of violence.