 Here, he went out to airfields to troubleshoot problems with the operation of radar in night fighters, designed modifications and oversaw their implementation.He later said that this was the most responsible job that he had in his life, at the age of just 21.In 1947, he was recruited by Frederic Calland Williams to join another ex-TRE colleague, Tom Kilburn, at Manchester University developing the world's first wholly electronic stored-program computer.