There are old London maps on the web. Try http://archivemaps.com/mapco/cross1851/cross1851.htm There is Tavistock Square if you choose the 4th rectangle from the left in the top row & enlarge it. For those who are looking for more modern addresses, bear in mind that roads have been renamed over the years & the properties renumbered to take into account new building & in later times rebuilding after the war. Penny Hampshire UK