 He stayed at Ferranti only briefly and later the same year, he joined the Royal Military College of Science at Shrivenham as a Senior Lecturer on a considerably higher salary, lecturing and leading lab studies on digital computing.In 1956, Tootill joined the Royal Aircraft Establishment (RAE), Farnborough, researching issues for air traffic control systems.Here he wrote, with Stuart Hollingdale, "Electronic Computers", Penguin 1965, which ran through eight printings and was translated into Spanish and Japanese.