The twins arrive in London and are taken on a trip down the River Thames where they are told about the species that live in the river. Following this, they visit The Monument and learn about the Great Fire of London. After learning facts about the display of decapitated heads of criminals and being shown Cleopatras Needle, the twins are then shown Tower Bridge and learn about its history and construction. John and Ed scored 27 points, while Edward and Richard scored 12. Winners: John and Ed, who won a ride on a speed boat on the River Thames Forfeit: Edward and Richard had to do the fish slaping dance