Nick Higham is a journalist and author known to TV viewers in the UK as a former correspondent for BBC News and also as regular host of its literary interview show: Meet the Author. His new book, The Mercenary River: Private Greed, Public Good, A History of London's Water, tells the story of a resource in the city many take for granted. But the flow of water, like any natural resource, has often been fiercely contested, diverted and exploited by profiteers in London over the centuries. Our host for this discussion is the author of books including As Kingfishers Catch Fire and Winchelsea, Alex Preston.

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