S1, E4: The roller-coaster battle in the Trainers' Championship continues as Paul Nicholls and his former assistant Dan Skelton go head-to-head in a series of big-money races at the Cheltenham Festival, the Olympics of jump racing. Nerves and pressure run high in the weighing room as the jockeys prepare for the festival's centrepiece, the Gold Cup, an event considered to be the most prestigious and iconic race in the jump calendar.