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A dozen technical books and countless articles.
Twenty apps for Apple, Amazon and Android.
Working with Thames Valley Police and the Met.
Jeff has been a founder and chairman of a number of public and private companies.
The guide includes an interactive map, journey planner, help and guidance, lock info, current river conditions and much more; the app is available for iOS (iPad, iPhone, iPod), MacOS, Android and Amazon Fire; Windows users can have all the app functionality via a web site.