As a commentator, the three days of the Grand National, the 175-year-old National Hunt race held in Liverpool every April, make up Holt’s biggest audience of the year. But he appears utterly unflappable, before and during the race. Just minutes before Channel 4 goes on air, all he’s got by way of notes is a tattered copy of The Racing Post, which he repeatedly flicks through before shutting his eyes and mumbling, trancelike, about reds and blues and greens. “Colours,” he exclaims, “are the absolute basics. You’ve got to know which horse is which just by looking, otherwise, you won’t be any good.”