Security Service (MI5), London opening hours

10TH FLOOR MILLBANK TOWER MILLBANK, London, Millbank, Greater London England, SW1P 4QP

Nobel House, 17 Smith Square, Nobel House, London, Greater London England, SW1P 3JR

17 Smith Square, London, Greater London England, SW1P 3JR

18 Smith Square, London, Greater London England, SW1P 3HZ

2 Marsham St, London, Greater London England, SW1P 4DF

2 Marsham St, London, Greater London England, SW1P 4DF

2 Marsham St, London, Charlton, Greater London England, SW1P 4DF

Great Minster House, 33 Horseferry Road, Great Minster House, London, Greater London England, SW1P 4DR

Seacole Building, 2 Marsham St, London, Greater London England, SW1P 4DF

10 St Ann's St, London, Greater London England, SW1P 2DE