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Timothy Walker is the hugely entertaining and sometimes controversial former Director of Oxford Botanic Garden, who brings a new angle to every subject. For many people pollination begins and ends with bees, but it is in fact carried out by all kinds of creatures, from bats (for night flowering species) to snails (for plants with time on their hands). Timothy looks at the huge variety of pollinators, and explains why knowing about them is so important for gardeners.