Brian Randell's main research interests are in the field of "computer science, specifically on system dependability and fault tolerance. His interest in the history of computing was kick-started by coming across the then almost unknown work of Percy Ludgate. This was over thirty years ago, when he was preparing an inaugural lecture, and led on to producing the book "The Origins of Computers". This triggered him to further investigate the Colossus wartime code-breaking machines".
Working alone, Ludgate designed an Analytical Engine while unaware of Charles Babbage's designs, although he later went on to write about Babbage's machine.
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Ludgate also helped advance calculators by expanding Charles Babbage's design for the first programmable computer.
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