Vocal coaches and husband and wife David and Carrie Grant are swapping singing in harmony for battling it out with antiques. With the help of experts Will Axon and Mark Stacey our competitive celebrity couple uncover some unusual items to sell at auction in rural Norfolk. David also visits a patch of inner-city grass in Cambridge where today children play and dogs are walked but was actually the birthplace of football, while Carrie learns how Letchworth Garden City sparked a revolution in town design.