St. Martin's Le Grand

St. Martin's Le Grand looking south:
Engraving by G.J. Emblem after T. Allom: The Post Office, St. Paul's Cathedral, and Bull & Mouth Inn, London in 1829.
The same view in 2007

St. Martin's Le Grand is a former liberty within the City of London, and is the name of a street north of Newgate Street and Cheapside and south of Aldersgate Street. It forms the southernmost section of the A1 road. For many years St. Martin's Le Grand was "often used as a synonym for the chief postal authorities, as Scotland Yard is used to designate the police", the headquarters of the General Post Office having been there from 1829-1984.