Old Bond Street
Chapter 4 reveals that Old Bond Sreet is home to Russell and Allen's, a shop where Constance goes to get her ball dress tied. This street is also home to a chain of high-end retail stores. With this being said, the shop is located in an upper-class area.
Coordinates
Latitude: 51.550319300000
Longitude: 0.004122800000
Longitude: 0.004122800000