The 75th anniversary of LEO I, the world's first commercial business computer, which ran its first operational job in November 1951, will be celebrated at The National Museum of Computing in November 2026.
Anniversary Highlights
The Anniversary: November 2026 marks 75 years since LEO (Lyons Electronic Office) completed its first live commercial run (a bakery valuation for J. Lyons & Co.).
Museum Collection: TNMOC houses specialised LEO historical materials and artifacts, and previously hosted society reunions featuring guided museum tours of its computing exhibits.
Society Plans: The LEO Computers Society coordinates archival preservation, talks, and celebratory activities leading up to and during the 75th birthday year.
You can also explore publications like Leo Remembered via the TNMOC shop.
