Colossus: The Worlds First Large-Scale Electronic Digital Computer - Part 5 | Bletchley Park @BletchleyParkTrust
Colossus: The Worlds First Large-Scale Electronic Digital Computer - Part 5 | Bletchley Park  @BletchleyParkTrust
Uploaded February 2024 | Updated September 2026, 4 days ago
In the final part of our series on Colossus, Dr David Kenyon looks at the legacy of Colossus.

Colossus, the world's first large-scale electronic digital computer, was designed and built to help the Codebreakers at Bletchley Park in their work on Lorenz, the German's most fiendish cipher.

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About Bletchley Park - Bletchley Park is a vibrant heritage attraction and museum, open daily to visitors. It was the home of British World War Two codebreaking; a place where technological innovation and human endeavour came together to make ground-breaking achievements that have helped shape the world we live in today.

This unique site was previously a vast Victorian estate, where parts including the Mansion still survive, expanding during wartime to accommodate Codebreakers' Huts and Blocks. During World War Two, the Government Code and Cypher School (GC&CS), now known as the Government Communications Headquarters (GCHQ), was based at Bletchley Park.

It grew from a small team of specialists to a vast intelligence factory of thousands of dedicated women and men. This extraordinary combination of brilliant and determined people and cutting-edge technology contributed significantly to Allied victory. In tough conditions, they provided vital intelligence and developed pioneering technological innovations that had a direct and profound influence on the outcome of the war.

The site continues to reveal secrets and tell fascinating stories of our national legacy. The Bletchley Park Trust - Bletchley Park Trust is a registered charity, heritage attraction and independent museum. As an independent charity, we rely on income from our visitors, Friends and supporters to secure the long-term future of the site.

Registered charity number: 1012743

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Colossus: The World's First Large-Scale Electronic Digital Computer - Part 5 | Bletchley Park

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