 After the Baby's first operation in June 1948, Alan Turing moved to Manchester so he could use the Baby for a project that he was working on at the National Physical Laboratory, where they had also been working on developing a computer.Tootill instructed Alan Turing on use of the Manchester Baby and debugged a program Turing had written to run on the Baby.In 1949, Tootill joined Ferranti where he developed the logic design of the first commercial computer (which was based on the Baby).