Page last updated at 12:18 GMT, Friday, 4 September 2009 13:18 UK

Calls for pardon for code-breaker Turing

Wartime code-breaker Alan Turing was chemically castrated for admitting to his homosexuality and written out of history. But now than 26,000 people have signed a petition to the prime minister seeking a formal apology and posthumous pardon.

Science Editor Susan Watts travels to World War II code-breaking centre Bletchley Park, where Turing worked, to find out more about the man and speak to some of his relatives.

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