The hand-drawn version was thought to have been lost but was rediscovered in 2011 and donated to the Bletchley Park museum soon after.

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Foreign Secretary William Hague MP launched the competition at codebreaking museum Bletchley Park in October 2012, as part of three GCHQ initiatives aimed at attracting young people into maths and computer science.

BBC: Schools' codebreaking competition winners announced

The rebuild of Edsac will be done in public at the National Museum of Computing at Bletchley Park.

BBC: Work begins on hardware to aid Edsac replica recreation

Tony Sale was the brilliant engineer who rebuilt the Colossus computer, established The National Museum of Computing at Bletchley Park and founded the Computer Conservation Society.

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He was the driving force behind the rebuild of the famous Colossus computer and one of the founders of The National Museum of Computing at Bletchley Park, as well as being a British spy-catcher.

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The National Museum of Computing (TNMOC) at Bletchley Park, Buckinghamshire, has been at the centre of efforts to fill the gap and ensure the full story of wartime computer development is told.

BBC: Wartime diary helps to tell Colossus story

Prior to embarking on the Colossus rebuild, Mr Sale worked at the Science Museum and, with Doron Swade, drove the recreation of other pioneering computers and helped found the CCS. He was also involved in the campaign to save Bletchley Park and was one of the founders of the National Museum of Computing.

BBC: Tony Sale: Computer restoration memorial prize launched

He has performed at Bletchley Park and will return there this month to the National Computer Museum to play live with Orchestral Manoeuvres in the Dark.

BBC: How computer games are creating new art and music