Live coverage of the 170th staging of the world's most famous steeplechase at Aintree, with the main event taking place at 5.15pm. Set to be watched by millions across the world, there will be as much as £200m wagered, making it the single biggest betting event of the year. 40 horses will compete in the race, with a prize of £1million going to the winners, and no doubt a lot of cash to some lucky souls out there who will have managed to bet on the winning horse, which in this race, is famously difficult to predict. Other races on the day will take place at 2.25, 3.00, 3.40 and 4.20pm.