3.6 stars. Sags a little when it splinters in the middle stretch, but contains startling use of concrete thingy metaphors and a soul-searing finale. Getting the Radiophonic Workshop on board was a real boon. Alun Armstrong is the scabbiest grotbag that ever stank out the screen - a convincingly Norfolk evil. Sean Harris combines method acting with silent film expressionism uniquely. Relentless and oft brilliant.