Just spent a very happy hour tracing all my London Ancestors, and where they lived by using this map. http: //www. theundergroundmap .com/article.html?id=42010 It runs from 1750 to 1950 although have to say 1940/1950 is not that good, but the rest is excellent. There is a small tab in the left hand corner which you can click on and it pulls down the dates. So once you have found your road you can see it develop into todays map.