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Thames House has been headquarters of the UK's Security Service, or MI5, since 1994. Clearly, the building is not open to the public and unwanted visitors will politely be asked to leave.
From MI5's website: "The role of MI5, as defined in the Security Service Act 1989, is "the protection of national security and in particular its protection against threats such as terrorism, espionage and sabotage, the activities of agents of foreign powers, and from actions intended to overthrow or undermine parliamentary democracy by political, industrial or violent means"."