22:005 Live Sport5 Live RacingHow to Commentate on the NationalBBC Radio 5 Live Duration: 30 minutes Wed 11th Apr 2018, 22:00 on BBC Radio 5 LiveJohn Hunt reveals the secrets behind calling the big race at Aintree.GenresSportHorse RacingBrand5 Live SportSeries5 Live Sport: 5 Live Racing Source: BBC Online