As he faced a long jail sentence, the life Niyah Smith had once dreamed of looked impossible. But the chance to turn his fortunes around came sooner than he expected. On a warm London afternoon, a black Audi A3 cruised slowly along a ring road. Four young men were inside, and they'd all just travelled to Birmingham and back. From his back seat, a 20-year-old named Niyah Smith looked up at the rear-view mirror and noticed a police car approaching.