Operation Primrose: U110, the Bismarck and the Enigma Code, Paperback

The capture of a working Enigma coding machine from the sinking U110 in May 1941, the pursuit of the battleship Bismarck later the same month, and the reason why British naval cryptographers won stole a march - when their own naval code had been cracked by the other side.

David Boyle is the author of a number of books about history, the future and new ideas in policy and economics. He is a journalist and a former independent reviewer for the HM Treasury and Cabinet Office.