Cas Is 19 years old, black. unemployed and a convicted small-time crook - one of life's losers. At a workshop run by the Burnbake Trust In south-east London, he is just one of 60 youngsters taking part In a remarkable social experiment. He tells of his battle to adapt to ithe world of work, learning to be a picture framer. With the voices of family, probation officer and employer and a background of his favourite reggae music, he describes his search for A Frame for Freedom. Producer GAVIN CAMPBELL