Very informative book,
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This review is from: Colossus: The secrets of Bletchley Park's code-breaking computers (Paperback)
I bought this on the Kindle for myself andd then as a birthday present on paper for my brother-in-law. We both liked the book very much.
The book has chapters written by different authors most whom were involved in the work at Bletchley. It includes a chapter by Tommy Flowers which reveals how cross he was that his work appeared to wasted after the war. In fact it was not ut he did not know that and surely his talent deserved better use than repairing telephone exchanges. It also includes a chapter by Roy Jenkins on his work at Bletchley which is fascinating.
It also has a full technical description of Colossus and an accessible discussion of the mathematics that underpinned Colossus.
All in all this is an essential book for anyone wanting to understand the work at Bletchley or the early history of computers.