Natasha Raskin Sharp is at Charles Rennie Mackintosh's Willow Tearooms in Glasgow for a celebration of all things 20th century and collectable. She looks back at some of some the best buys of the past, touring around the country meeting some of the show's favourite experts and auctioneers. Anita Manning gets the lowdown from expert Ben Cooper about his family connection to Whitefriars glass, and Tim Weeks shows off some collectable tech. Natasha also shares some hints and tips about buying and selling 20th-century collectables.