Latvia. The smal I Baltic state of Latvia leads Europe in the proportion of young people it puts behind bars. And, as Meriel Beattie finds out, the state is strugglingto cope. She goes to the capital Riga to meet the young people who are stepping into the breach -the ex-prisoner who's single-handedly rehabilitating young offenders, and the film-maker couple who are using painting to help children off the Streets. Repeated from Thursday