There is a book that came out a few years after this thread was started called “Colossus: Bletchley Park’s Greatest Secret” by Paul Gannon. It’s been years since I read it but scanning the TOC makes it look like it should answer the OP’s question.
There is a book that came out a few years after this thread was started called “Colossus: Bletchley Park’s Greatest Secret” by Paul Gannon. It’s been years since I read it but scanning the TOC makes it look like it should answer the OP’s question.