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Shah and Comrie will both be jailed while Ogunnubi-Sime was sent to a young offender institution.

In the documentary, called Idris Elba: Our Knife Crime Crisis, the Hollywood star meets a 17-year-old boy at Feltham young offender institution who first began carrying a blade when he was 13.

The younger boy, 15, appeared first by videolink from Feltham Young Offender Institution and spoke only to confirm his identity.

At Nottingham Crown Court, Osaseri was sentenced to eight years in a young offender institution, after admitting wounding with intent, theft from a person, possession of a knife in a public place and possession of a Class B drug with intent to supply.

James Greaves, 19, of Hatt in Cornwall, was sentenced to three and a half years in a young offender institution with Taylor Rowsell, 18, of Rosebery Road in Exmouth, Devon handed a two year sentence.