I work in youth justice and I feel that local councils having control would most likely be a good thing.
To me it feels like the YJB are too centralised and distant. At a recent inspection of my team the inspectors knew nothing about the local area that we work in or about the other services that are available to support us. The crime problems facing each area differs, for example some areas are far more likely to have problems with gun crime and gangs, which isn't really a problem where I work, but acquisitive crime such as pickpocketing and street robberies are prevalent most likely due tome working in a large seaside tourist town.