Tony Sale with the Colossus Rebuild

In 1994, a team led by the late Tony Sale began the rebuild of the Colossus computer to commemorate the achievements of the work of Tommy Flowers, Bill Tutte and the men and and women who worked in the wartime codebreaking operations Bletchley Park.

Working with fragments of information, including eight photographs of Colossus taken in 1945 and a few circuit diagrams, the team managed to reconstruct Colossus Mark II. On November 15 2007, a rebuilt fully-functioning Colossus Mark II was unveiled to the public at The National Museum of Computing on Bletchley Park.