Rolls Royce makes the most complicated and powerful jet engines in the world. Visiting their biggest factory, which employs over 11,000 people, this programme shows how they do it. These are people who quite literally have our lives in their hands; it's their designs that keep jumbo jets in the sky, their skills that have made flying the safest mode of transport and their innovations that will allow aeroplanes to be bigger cleaner, greener and quieter...