The Secret Intelligence Service (SIS), commonly known as MI6,[1] is the United Kingdom's intelligence agency which collects intelligence about foreign countries.[2] It is a branch of the Foreign Service, and it reports to the Joint Intelligence Committee.
The service was formed in 1909 as the Secret Service Bureau, but its existence was not officially acknowledged until 1994.[3]
The service works with the Security Service (MI5), Government Communications Headquarters (GCHQ) and the Defence Intelligence (DIS). SIS deal with the United Kingdom's espionage (spying) activities outside the United Kingdom.
The headquarters are at Vauxhall Cross in London in a purpose-built building. The building was approved in 1988 and completed in 1994. The cost of the project was £135 million for site purchase and the basic building or £152.6 million including the service's special requirements.[4] In John le Carré novels the building is called The River House.