For a start, houses with only a name and not a number in this country are rare, usually rural and distant from other properties. There are however many who like to use their house name over their house number. This is pure snobbery. Our cities (and London in particular) were not designed around nice neat block schemes. The street layout is ancient. That means if you look at an A-Z map of London you will see something that looks like a bowl of Spagetti. New buildings intersperced with old buildings etc. The British public are very fond of this. Any attempt to change it would be met with fierce resistance. New developments are switching from straight streets to windy messes to discourage on street parking, speeding, and for the nicer appearance. So you would still have to find margret thatcher cul de sac at the end of john prescot drive, off david blunkett avenue. (One of my pet peeves. streets named after politicians)