GCHQ green plaque

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Connection to This Location

# GCHQ's Hidden Genesis Standing before this unassuming London address, you're gazing at the birthplace of British signals intelligence as we know it today. Between 1919 and 1921, this building housed the freshly formed Government Code & Cypher School—a revolutionary merger born from the ashes of t...

Inscription

1919-1921 The first home of GCHQ The Uk's intelligence, security and cyber agency known then as GC&CS, formed from the Admiralty's Room 40 and the War Office's MI1(b)