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Natasha Raskin Sharp looks back at gadgets bought by the teams over the years and drops in on some of the show's favourite experts and auctioneers. Anita Manning visits Nottingham to learn about a machine that revolutionised time keeping, Natasha is off to Edinburgh to look at an object that to changed the way we see the world, and Christina Trevanion learns about a very useful gadget, invented in the 17th century to predict the weather.