Find out more about MI5’s mission and core values; our people who work to keep the country safe; and our rich and varied history.
Our headquarters, Thames House, in central London is a Grade II listed building in Westminster, not far from the Houses of Parliament.
Find out about the core threats to national security that MI5 exists to protect against.
The National Protective Security Authority (NPSA) is part of MI5 and offers advice to businesses and organisations to help keep them and their customers safe from a range of national security threats.
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