Billy Connolly’s Tracks Across America ITV, 9pm
In Portland, Oregon, the comedian meets Farmer Tom, a prize-winning vegetable farmer who has turned his green fingers to organic cannabis growing. His next stop is the stunning California coast – home to a cacophonous elephant seal rookery – the largest in the world. From there, he heads to the deserts of Arizona to meet the men and women on the frontline of US border control. Deep underground in a former nuclear missile silo Billy learns of America’s biggest cold war secret.