‘Why would I put myself through this? Multiple times? For three months?’: James Norton on the A Little Life play and his Happy Valley return

From March, the actor will lead the West End adaptation of Hanya Yanagihara’s tragic bestseller. But right now, he’s back as the monstrous Tommy Lee Royce in one of the BBC’s best ever dramas. He talks to Ellie Harrison about trauma, baptisms of fire, and why you should do the things that scare you