In Our Time was about Alan Turing this week, and very good it was too. All three guests (Leslie Ann Goldberg, Professor of Computer Science and Fellow of St Edmund Hall, University of Oxford; Simon Shaffer, Professor of the History of Science at the University of Cambridge and Fellow of Darwin College and Andrew Hodges, Biographer of Turing and Emeritus Fellow of Wadham College, Oxford) were articulate and knowledgeable. I was very struck with Shaffer - perhaps because I had never heard of him before - and his insistence that Turing owed a lot of his apparently abstract and abstruse leaps forward to a practical, material groundedness; hence the Turing machine.
A man to follow is SS, http://www.imaginaryfutures.net/2007/04/16/ok-computer-by-simon-schaffer/ is a link I have found. It makes an interesting Turing/Michael Polanyi connection. You know, Polanyi - the tacit knowledge guy.