It's a glorious summer's day in Kent as the Antiques Roadshow arrives in Walmer Castle near Deal, where treasures include a valuable Wemyss piglet, a remarkable prisoner of war diary and a showstopping collection of ceramic grotesque birds by Martin Brothers. There are surprises in store for a woman who has always believed that her mother's ring contained a large topaz stone, and the owner of a rare Wemyss piglet, casually kept on a windowsill. A late 18th-century round revolving table with a secret compartment intrigues furniture expert Lennox Cato, while books specialist Justin Croft is enthralled by the story of Captain Webb, the first recorded man to swim the channel in 1875. Other curiosities include the diary of a British prisoner of war held captive in Germany, complete with photos of amateur dramatics, cartoons, and labels saved from food packages, and a beautiful set of French fashion illustrations from the 1920s. Rare objects include a table clock by renowned 17th-century maker Daniel Quare, and a showstopping collection of Martin Brothers pottery cherished by a man who began buying the bizarre, grotesque birds long before they became fashionable. Andy McConnell challenges Fiona to spot 'the Impostor' amongst a collection of Roemer glasses, only one of which is a genuine 18th-century piece - with a surprise guest appearance from Andy's mum.