Little has acquired plenty of plaudits for his work but he has also picked up a reputation for being, as he puts it, "casual". "It's true I've worked harder on some projects than others," he admits. "A friend warned me that I would have to get my act together working with Cook or he'd act me off the stage. And it's true: Cook is the hardest-working actor I've ever met.
"But I'm working hard too," he adds. "Theatre is terrifying because it's pure craft and I don't have any training to fall back on. I just have my experience. I'm probably due a fall but, so far, things have gone great. I couldn't ask for more."
On The Ceiling, previews now, opens Sep 12, until Dec 31, Garrick Theatre, Charing Cross Road WC2, Mon to Sat 7.45pm, Wed mats 3pm, Sat mats 3.30pm, £15 to £37.50. Tel: 0870 890 1104. Tube: Leicester Square.