Their rival, Nintendo, will provide more detail about the release of its Wii U games machine at a New York event on Thursday.

BBC: Microsoft patent diagram

Detective Superintendent Simon Chesterman, from Thames Valley Police, said there was an on-going investigation into the theft of the machine but denied any connection with the release of Mr Yates.

BBC: Enigma 'handler' released from prison

Then, in 1975, a change of government brought a change in policy and Prof Randell was invited to the Cabinet Office to discuss the first official release of information about the Allies' main codebreaking machine.

BBC: The road to uncovering a wartime Colossus