In the final Olympic Journey programme before the games begin, diver Tom Daley tells Gabby Logan that nothing less than gold will do for him in Rio. Darren Campbell catches up with the fastest British woman in history, Dina Asher-Smith, while Kat Downes meets gymnast Max Whitlock as he puts the finishing touches to his preparations. Jason Mohammad goes to see rugby superstar Sonny Bill Williams, who will take on rugby sevens in Rio. Show less