Hi
I gave the list of missing areas of London from Findmypast not Ancestry, though Ancestry's list is the same - supplied by The National Archives who have gone through the surviving census returns and listed missing piece numbers (enumerator's books), though not necessarily streets which enumerators missed out or pages missing from their books, just where the book itself is missing. So if you think differently you need to contact The National Archives and talk to them about it. They are the ones who filmed the census enumerators books and sold on the rights to the films to the likes of Ancestry and Findmypast who indexed the people on them.
Places are often listed differently under the 1841 census being smaller they come under adjacent place names or under parish names e.g. St something instead of the place and they be incorporated into different areas. The easiest way to tell might be to compare the 1851 census with the 1841 census. As I said before the numbering system does not necessarily indicate a piece is missing.
e.g. Wapping 1851
1a, 1b, 1c, 1d, 1e and the workhouse
St John Wapping 1841
10, 11, 12, 13, 14 and the workhouse
Regards
Valda