In a very short space of time – less than a decade really – technology has changed the way people live their lives. It has also changed the way they work. It was in 2008 that Kevin Roberts, the worldwide CEO of Saatchi & Saatchi, told me how his iPhone freed him from the constraints of geography, enabling him to run the business as effectively from his home in New Zealand as from his office in New York or Lancashire, where he happened to be at the time.