Hailed by John Hurt as the 'best of the bunch', Oldman is a working-class hero acclaimed for his acting and directingGary Oldman returns to London this weekend in the role of prodigal son, the wayward talent brought in from the cold. He arrives from California to find a landscape very different from the one he left in the early 1990s.The fiery social-realist BBC teleplays that provided an early calling card have bitt…