Frankie Dettori and Simon Pegg join Chris Evans and Alex Jones in the One Show studio. The African Children's Choir from Gary Barlow's Commonwealth Band perform live in the studio. Alex Riley road tests a sat nav from 1920, Jay Rayner visits the world's biggest sandwich factory, Carrie Grant reminisces over that classic toy synthesizer the Casio VL-1 and Jason Dors Lake, the son of Diana Dors, tells us about his tragic childhood.