Royal Naval "Wrens" also worked on "Colossus" as well as the Bombes. Alan Turing's genius contributed significantly to the development of these machines They were used to crack a new and even more complex German High Command code using binary number system.
Colossus worked in conjunction with the Tunny machine to crack this highly complex code. The Tunny machine rebuild was the subject of a previous Smiler.
Another lovely piece of collectable art from Steve Williams.