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Mark Carwardine is a zoologist, writer, photographer, consultant and broadcaster with a special interest in marine wildlife. He has written more than 40 books, including several bestsellers, and presents Nature and a wide variety of other natural history programmes on BBC Radio 4. A keen diver for many years, he leads shark and whale-watching holidays to many parts of the world and is an ardent supporter of several wildlife conservation organisations.

Laura Cumming is art critic for the Observer. Previously, she was Arts Editor for the New Statesman and Arts Producer for the BBC.