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SOME 25,000 households in the UK live free of mains water and energy supplies. Nick Rosen spent months in a camper van visiting some of them. A fan of the off-grid lifestyle, his book gives good tips for those aspiring to it, such as how to install a sewerage system. But it left me wondering: why do it? Rosen lists many reasons – from saving money to sustainable living – but the only one that rings true is his desire to be self-sufficient. Even that is contradictory, since he was utterly dependent on his cellphone network, perhaps the most pervasive…