It's the battle of the hats on this leg of the road trip, as we decide who wears it best between dealer Irita Marriott or expert Mark Hill. Today they navigate the Fens in search of an antique that will make a fortune at auction. Getting them from shop to shop is a 1960s Triumph, and a bag of sweeties helps to keep their spirits high.Mark falls head over heels for a very stylish and shiny mid-century kitchen appliance, while Irita uncovers something so gold, garish and gaudy it may not sell at auction. They also find a collectable with a very grisly and gruesome history.Away from the shops, Mark discovers a massive three-and-a-half-thousand-year-old structure, lost for centuries under the wetlands, and Irita heads to King's Lynn to hear how the humble lives of the town's fisherfolk inspired a great 20th-century composer.And then it's off to the auction to find out if the old adage 'If you want to get ahead, get a hat' holds true.