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The ' Our Computer Heritage ' Site, Feb 2012.

Here you’ll find technical information on 90% of the British-designed computers that came onto the market in the period 1950 – 1965. The data, compiled by the Computer Conservation Society, covers the major stored-program electronic digital computers manufactured by six historic UK companies:

Elliott Brothers (London) Ltd.
Ferranti Ltd.
Leo Computers Ltd.
English Electric Ltd.

To see information on the deliveries and applications, systems architectures, instruction sets, software and programs, or references for these early British computers, follow the links from the company names given in the menu on the left.

Below is a general time-line of the machines and companies covered by our computer history project. Click on a company name to learn how each firm became involved in building computers. There is also a brief introduction to the computers themselves.

To see photographs of the computers featured, go to the Picture Gallery. If you are new to the computer terminology of the 1940s and 1950s, you may find the Glossary. helpful. If you’d like to see which UK museums have displays or items of equipment from the early British computers featured on this site, click on Where to see bits. The information on this website has been collected over the period 2004 to 2011 by volunteers from the Computer Conservation Society (CCS), a specialist group of the British Computer Society. The names of individuals and organisations who have helped with our computer history project are given under Acknowledgements. If you would like to send the CCS some comments, there is a message facility at the Feedback. section.
© 2012 Computer Conservation Society All Rights Reserved The material and its presentation on this site is the copyright of its owners and the Computer Conservation Society. You are free to enjoy and use any of the material for non-commercial purposes without charge, provided that it is not used misleadingly. Please acknowledge the Computer Conservation Society website as the source of the material. Note that this permission does not extend to any material on this site which is identified as requiring permission from its third party copyright holder. Please seek specific permission to use such material. We try to ensure that the material on this site is accurate, but there may be inaccuracies, omissions or out-of-date information. We can take no responsibility for its misuse, and cannot be held liable for any errors or loss which may arise. We encourage hyperlinks to this website.
If you have any queries, please Contact the Computer Conservation Society:
or e-mail comments to Simon Lavington :
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Last updated: Monday, 23-Jan-2012 18:51:00 BST;