The Turing Digital Archive contains nearly 3,000 images of letters, photographs, newspaper articles, and unpublished papers by or about Alan Turing. The images were scanned from the collection of Turing papers held in the Archive Centre at King's College, Cambridge. The images are subject to copyright restrictions.
For an insight into Alan Turing's life and works, along with highlights of BBC programmes shown during Turing's centenary year see:
For further information about code breaking during World War II see:
The Enigma and the Bombe http://www.ellsbury.com/enigmabombe.htm
Alan Turing http://en.wikipedia.org/wiki/Alan_Turing
Solving the Enigma: History of the Cryptanalytic Bombe http://www.nsa.gov/about/_files/cryptologic_heritage/publications/wwii/solving_enigma.pdf
Enigma Cipher Machine http://www.cryptomuseum.com/crypto/enigma/
Turing at NPL http://www.npl.co.uk/about/history/notable-individuals/turing/
The Guardian features articles, commentaries and blog posts on Turing's life, works and legacy.