here (that's a screenshot from the Greenwood map, above).
Although London in 1827 was amazingly different from London of 1811-13, I still use it sometimes because you can really zoom in on a location and print it out. (Once upon a time I had the entire map printed out and mounted on giant sections of foam board, but then this little thing called Katrina flooded my office, and that was the end of that.)
here. It's also available in book form from the same people who print the 1813 Regency map.