Ed Chamberlin and Francesca Cumani present coverage of the early races on Grand National Day from Aintree, starting at 2.25, 3.00, 3.40 and 4.20.
Hot favourite Tiger Roll will bid to become the first horse since the legendary Red Rum 45 years ago to win back-to-back runnings of the Grand National at Aintree on Saturday.
Bookmakers say £150m is set to be bet on the race's 172nd running, with many likely to back last year's winner.
Tiger Roll, who will again be ridden by jockey Davy Russell, heads a maximum field of 40 for the 17:15 BST race.
His Irish trainer Gordon Elliott saddles a race-record 11 runners.
Tiger Roll's rivals will include Rathvinden, Anibale Fly, Vintage Clouds and Pleasant Company.
Champion jockey Richard Johnson is riding in the race for a record 21st time, but has yet to win. He is on board Rock The Kasbah, whose name is a nod to the hit 1980s song by the Clash.
Two women have rides in the race as they look to become the first female jockey to triumph - Lizzie Kelly is on Tea For Two, while Rachael Blackmore rides Valseur Lido.
With analysis from AP McCoy and Brough Scott, reports from Luke Harvey, Mick Fitzgerald, Rishi Persad, Alice Plunkett and Brian Gleeson, Matt Chapman and Chris Hughes, and commentary by Richard Hoiles.
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