The title of the 1st episode on Season 2 of Sherlock, the TV-series is A scandal in Belgravia. What is Belgravia?
It was used as an alternative UK based location for the original Arthur Conan Doyle story which was A Scandal in Bohemia. Belgravia was probably chosen because of the alliteration with the word 'Bohemia' and the reputation of the area as being a location of rich and powerful people, who Irene Adler (as a professional and very expensive dominatrix) might find clients.
Well, I presume it's the district in London but I have not seen the episode, so I may not be correct.