Thames House

Thames House stands on the north bank of the River Thames in Millbank, London, near Lambeth Bridge. Built in 1929–30 by John Mowlem & Co, it was designed by Sir Frank Baines in the Imperial Neoclassical style. The building’s frontage features statues of St George and Britannia by Charles Sargeant Jagger. Originally constructed for Imperial Chemical Industries, it later became home to the Security Service (MI5) in 1994. The Northern Ireland Office also occupied part of the building until 2013. The building’s history reflects its evolving role in British governance and security. After serving as offices for the Department of Energy, it was refitted for MI5 between 1990 and 1994 by the GMW Partnership and Mowlem. A miniature monorail system was installed to transport files from the basement. The refurbished Thames House was officially opened by Prime Minister John Major in November 1994. Its Grade II listing recognises its architectural significance. Visitors see a grand neoclassical façade with sculpted figures and a distinctive archway. Inside, the refurbished interiors house MI5’s operations, though public access is restricted. The building’s riverside location offers views across the Thames towards Lambeth Bridge. Its association with espionage has made it a recurring setting in popular culture, including appearances in the BBC series *Spooks* and *Torchwood*. The exterior and lobby remain notable landmarks in Westminster.