Peter Mullan’s incendiary and long-overdue third feature is an unflinching, often hilarious look at a teenager’s inexorable descent into delinquency. NEDS (or Non-Educated Delinquents) begins in Glasgow in 1972, immersed in a rosy haze of promise as the chubby-cheeked, saucer-eyed John McGill graduates from primary school. Moments later he’s being threatened with a beating to end all beatings by a malevolent peer.