Peter Lipscomb pays to tribute to John Herivel, WWII code-breaker and Sidney alumnus, who has died at the age of 92.

John Herivel was one of eleven Sidney members working at Bletchley during the war. Peter Lipscomb has published a moving tribute on the Bletchley Park website, which explains more about John Herivel's extraordinary life and work.

This is an archived news story, first posted in 2011.

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