General Post Office, London

General Post Office
The 19th century headquarters of the General Post Office in London
General information
Architectural style	Grecian
Address	St. Martin's Le Grand
Town or city	London
Country	United Kingdom of Great Britain and Ireland
Coordinates	Coordinates: 51°30′59″N 0°5′49″W / 51.51639°N 0.09694°W / 51.51639; -0.09694
Construction started	1825
Completed	1829
Demolished	1912
Client	General Post Office
Dimensions
Other dimensions	400 feet (120 m) long, 80 feet (24 m) deep
Design and construction
Architect	Robert Smirke

The General Post Office in St. Martin's Le Grand (later known as GPO East) was the main post office for London between 1829 and 1912, the headquarters of the General Post Office of the United Kingdom of Great Britain and Ireland, and the country's first purpose-built post office before it was demolished in 1912.

Originally known as the General Letter Office, the headquarters for the General Post Office was built on the eastern side of St. Martin's Le Grand in the City of London between 1825 and 1829 to designs by Robert Smirke.

This was the UK's first purpose-built post office. It was built in the Grecian style with Ionic porticoes, and was 400 feet (120 m) long and 80 feet (24 m) deep. The building's main facade had a central hexastyle Greek Ionic portico with pediment, and two tetra style porticoes without pediments at each end. The main interior was the large letter-carriers room, with its elegant iron gallery and spiral staircase.

From 1868, the GPO experimented with the London Pneumatic Despatch Company services which operated a pneumatic tube from Euston railway station for the delivery of mail, but the experiment was unsuccessful and terminated in 1874.

In the 1870s a new building was added on the western side of St. Martin's Le Grand to house the telegraph department, and the GPO North was constructed immediately to the north of the telegraph building in the 1890s as the GPO continued to expand. To avoid confusion, the original General Post Office was renamed GPO East.

When the Central London Railway was constructed in 1900, a nearby station was named Post Office (now called St. Paul's). Robert Smirke's building was closed in 1910 and demolished in 1912 and BT Centre, a post-World War II building and the current headquarters of BT Group, stands on the site of the old telegraph office.