A cache of papers found in a loft and almost shredded is tipped to sell for £150,000 after they were found to be the work of wartime code breaker Alan Turing.
The 'Alan Turing Papers' are the origins of computer science by the genius mathematician.
They include his personal signed copy of his 1938 PhD dissertation, 'Systems of Logic Based on Ordinals'. It is valued between £40,000 to £60,000.
Also featured is his paper 'On Computable Numbers' also known as 'Turing's Proof' which introduced the world to the idea of a universal computing machine in 1936.
It is has been described as the first programming manual of the computer age and also has a guide price of £40,000 to £60,000.
