The National Museum of Computing (TNMoC) is housed at Bletchley Park
It is a separate trust with their own admission fee. The Colossus and Tunny rebuild galleries are open 10.30 – 17.00 (Last admission 16.30) all year round. The rest of TNMoC, which traces the development of computing from Colossus, the world’s first electronic computer, through to the modern-day, has limited opening hours so please check before travelling.
The use of machines to break into Lorenz, the high-grade cipher machine used by Hitler and his High Command to encipher strategic messages was the brain-child of Bletchley Park Codebreaker, Max Newman. Colossus was developed by General Post Office engineer, Tommy Flowers, to help speed up the process.
A rebuild of a wartime Colossus computer can be seen daily by visitors to Bletchley Park at The National Museum of Computing. TNMoC operates independently of the Bletchley Park Trust.
Visit their website here for more information.