Ada, Countess of Lovelace
12 St James's Square.
The first "computer programmer" of Charles Babbage's Difference and Analytical Engines.
GPS grid coordinates:
Latitude: (WGS84) N51:30:28 ( 51.507743 )
Longitude: (WGS84) W0:08:11 ( -0.136415 )
The brown brick building on the corner, at 10 St.James Square, is the Royal Institute of International Affairs a famous diplomacy, security and intelligence think tank, known as Chatham House, famous for the Chatham House Rule:
"When a meeting, or part thereof, is held under the Chatham House Rule, participants are free to use the information received, but neither the identity nor the affiliation of the speaker(s), nor that of any other participant, may be revealed."