Anna's thirst for culture
The first question one should ask is why is this millionaire gal "trodding" around the bohemian parts of London.
we find that she is totally bored with american "values" and is seeking an infusion of culture.
we see that although Hugh suggests an up-market book on Turkey she wants to start at low end with a coffee-table book with pretty pictures, ie to ease her OUT of american LACK of culture and IN to European culture.
without that plot element we don't have a movie.
in the end she GETS her wish, escapes america, and lives IN England with a bloke who knows all about culture SO with her dollars they can EXPLORE such culture at their hearts' desire, as we see in final scene.
http://www.kindleflippages.com/ablog/