In the mid-1980s, as Holocaust “awareness” bloomed in western societies, Britain woke up to the revelation that, for 40 years or so, it had provided a safe haven for refugees from eastern Europe whose participation in the genocide had rarely, if ever, come under scrutiny. It was a deeply uncomfortable awakening for a country that had prided itself in “standing alone” against Hitler’s tyranny. The passage of the War Crimes Act 1991 raised the possibility of putting on trial those who had not been British citizens or residents at the time the crimes were committed. The outcome was the prosecution...