Christina Trevanion puzzles fairgoers with a darned good invention, but can they guess what it is? Ardingly antiques fair in West Sussex is the destination for a dash around the stalls, with experts Tim Weeks and Nick Hall. With £300 in their pockets, two teams of families try to buy three items in an hour. On the red team are mum and daughter Sarah and Moya. This "horse-mad" duo are aiming to 'gallop to victory', but it's a nay to a cast-iron horse's head with a budget-busting price tag. Over with the blues, geographer dad Robin gets in a spin when he spots a little globe, but Nick's impressed with its condition. Then it's off to Buckinghamshire for the sale with auctioneer Tom Baxter. He gives his all-important estimates to Christina before the teams' items go under the hammer. Only the bidders can decide who wins!