A series that explores why controversial policies, fashions and fads take hold. 3: Cheap ConcreteDreary, stained and crumbling concrete blights much of our urban environment. Chris Bowlby analyses an ugly construction mixture of architectural shock tactics, cost cutting, untried techniques, hatred of alternative materials and a bizarre fondness for a hundred shades of stained grey. Why was concrete was used so badly in the rebuilding of postwar Britain? Producer smitaPatei