Very likely to be the same Nodes I suspect. They are still operating in my hometown area of North London.
For the book version of the diary, I think its essential to have an 1846 map in there. As well as the characters (surely the stuff you guys are finding out on here would be key to include in the book), you need to be able to visualise where all this was happening. For example, where Nat works is now the site of (Victoria?) train station, and the canal where the barges went to the basin is now just 50ft long and has housing on it! On top of this many roads and names have changed. So, it you want to look up where he went, walked on sundays, where Ecclestone Wharf etc actually was, you wont find these on current maps.
steve