Mark Smith hears the story of the twist of fate that led to an airman missing a flight which crashed during the famous Dambusters Raid, while Frances Christie is thrilled to see a distinctive work by LS Lowry which was owned by a woman who befriended the artist at the end of his life. Justin Croft sees a charming collection of souvenirs from the original Crystal Palace, which was built for the Great Exhibition of 1851, while John Foster is excited to see a collection of rare car club membership badges, including one from the earliest days of motoring in Iraq. Mark Hill reveals a love-hate relationship with a modern collectible, My Little Pony toys, and finds out how the market for all things vintage continues to grow. Serhat Ahmet challenges Fiona to identify the most valuable porcelain cup in a trial dubbed 'high tea or low tea'.