National Archives UK

The National Archives of the United Kingdom Discovery service is the official search portal for records held by The National Archives at Kew, providing access to descriptions and some digitized content from over 32 million records spanning 1,000 years of British history. For OSINT investigators, genealogical researchers, historical analysts, and journalists, Discovery provides a gateway to government documents, legal records, military service files, colonial records, and policy documents that reveal historical facts not available in any other source.

The Discovery catalogue describes records held not only at The National Archives but also at over 2,500 archives across England, Wales, and overseas — making it the most comprehensive finding aid for British archival material. Search results include the title, date range, department of origin, reference code, and in some cases, digitized images of the actual documents.

For investigative researchers, key record series include: Cabinet papers revealing government decision-making, Foreign Office correspondence documenting international relations, War Office records containing military service information, Colonial Office files covering territories, police records, court documents, and immigration records. Many previously classified files have been declassified and are accessible — particularly files from the 20th century that have passed the standard 20 or 30-year release periods.

Military service records are among the most sought-after for genealogical and biographical investigation. Records for World War I and II veterans, colonial service personnel, and regular army servicemen reveal service dates, units, campaigns, physical descriptions, and sometimes disciplinary records. These support both genealogical research and historical investigations into wartime activities.

For journalists and policy researchers, Cabinet papers and departmental files provide contemporaneous documentation of historical decisions — invaluable for accountability journalism covering historical events and their modern consequences.

Some records require in-person consultation at Kew; others are available through digitization partners including Ancestry and Findmypast under subscription.

Document specific reference codes (e.g., WO 363, FO 371) and piece numbers for precise citation in research and legal proceedings.