Can anyone recommend a more technical book on the design and operation of the Colossus? I've found Colossus, a collections of essays edited by B. Jack Copeland, but not much else, at least on Amazon. (Also interested in anything on Zuse's computers, as I've mostly studied the Atanasoff-Berry Computer and Eniac).
There are a lot of articles written about early machines available from the (British) Computer Conservation Society. The CCS journal is available online at [1]. One article (with a link to a GitHub) discusses making an FPGA version of Colossus.
There are many articles written by people who were involved in early computing in the UK.
the bletchley park trust sells (used to?) pamphlets in the gift shop that they call "reports" which have been written by some of the rebuild team and other associates.
