e to acknowledge with thanks my previous coauthors Mr Mike Fitch, now with British Telecom Research at Martlesham Heath, Mr David Ogley, now working in the psychiatric profession, an industry increasingly closely aligned with our own and my ex-codirector and business partner Roger Belcher with whom miraculously I am still on talking terms after nearly thirty years of close technical and commercial cooperation. Roger's crucial role at RTT and on all previous book projects has been to spot and correct gross errors of a technical nature. His absence as an arbiter of this particular work is therefore alarming but I am assuming that after thirty years of working on engineering projects in the industry I should be able to correct most mistakes on my own, an assumption that I hope does not prove to be misguided. And rather than attempt this particular literary Everest completely solo and without the aid of extra oxygen I have called on the services of my other friend John Tysoe of the Mobile World to provide relevant financial analysis and market and business statistics that I hope will help integrate the technology and engineering story that we have to tell with the market and business dynamics of our industry today. Thanks are also due to my close friend and business 1 Copies of these books can be bought either from Amazon or American Book Exchange http://www. abebooks.co.uk/. 2 http://www.guardian.co.uk/books/2011/feb/04/michael-moorcock-hari-kunzru Hari Kunzru Interview with Michael Moorcock, Guardian 4 February 2011. Acknowledgements colleague Jane Zweig who has been patiently helpful at explaining why the US continues to be bafflingly different from the rest of the world. Thanks also to Tony Hay for unearthing useful articles on battery technology from the British Library. John Liffen and Tilly Blyth in the telecommunications and computing curatorial department at the Science Museum have also been a great source of inspiration. In particular they have demonstrated that the Museum has case study resources that docu