Stephen Berkoff has always been the bad boy of British theatre. At East’s London première in 1975, the critics howled. Berkoff’s first play was filthy, with explicit references to sex and violence. Yes, the 1950s had spawned Kitchen Sink Drama, exposing the lives of the lower classes to a predominantly middle-class British stage. But Berkoff’s characters weren’t just battling East Enders. They were angry. They blamed the system. They were articulate.