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Available for over a year

Dan Saladino goes far below the London streets, to investigate a hydroponic farm growing microgreens and salad leaves in a forgotten tunnel complex. This is the second in a special series of three programmes, profiling the finalists in the 'Future Food' category in the 2017 ÃÛÑ¿´«Ã½ Food and Farming Awards. Producer: Rich Ward.