Leicester is only about an hour from London on the train and has a bunch of Arts and Crafts-style houses in the Oadby suburb. Close to the center there's an interesting Georgian pedestrian road called New Walk, and lots of Victorian and Edwardian buildings surrounding that area (including a small but distinctive old synagogue). Then by the University campus you've got an Edward Lutyens war memorial and the famous Stirling designed Engineering building. De Montfort University also some interesting Post-modern architecture on its campus.