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].

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. [1] <https://www.computerconservationsociety.org/resurrection.htm https://www.computerconservationsociety.org/resurrection.htm>