There is a photography exhibition that is currently running until 15th October At the Tate, Liverpool called Portraying a Nation: Germany 1919 - 1933 with photographs by August Sander and paintings and drawings by Otto Dix. It deals with the Weimar Republic leading up to the rise of the Nazis. Bernie Gunther would have felt right at home! I recommend it if you get a chance especially the photography of Sander which covers different aspects of German society.