General Letter Office

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 1910, 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. It was demolished in 1912.

Originally known as the General Letter Office, the headquarters for the General Post Office (GPO) 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 tetrastyle porticoes without pediments at each end. The main interior was the large letter-carriers' room, with its elegant iron gallery and spiral staircase.

While externally attractive, however, the building suffered from internal shortcomings. Poor layout meant that work requiring bright light was conducted in poorly illuminated areas; odours spread from the lavatories to the kitchens, while the combination of gas lighting and poor ventilation meant that workers often felt nauseous. The expansion of the work of the Post Office also meant that by the later 19th century it was occupied well beyond its intended capacity; The Times reported in 1860 that "rooms have been overcrowded, closets turned into offices, extra rooms hung by tie rods to the girders of the ceiling".

From 1868, the GPO experimented with the services of the London Pneumatic Despatch Company, 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.