Taron Egerton "took a year" to find a role as "meaty" as playing Sir Elton John

He told The Hollywood Reporter: "I felt that when I did 'Rocketman' I was offered a really grown-up, complex role, and I think I'd been craving something like that - something that was meaty and that I could really get stuck in.

"And then when it was done, I wanted the same thing.

"It's difficult when you've done something like that because not everything you get offered is as good or as interesting or as complex or as challenging for an actor, and it took a year.

"It was a year after 'Rocketman' came out that I was presented with this, and it was the thing I'd been waiting for.

"It's a cast of great roles and I had the feeling it was going to be something special, and I do believe it is actually if I do say so myself."

The drama, which is based on a true story, marks Ray Liotta's final TV role, and Taron admitted it was a "quite profound" experience sharing the scene with his late co-star, who passed away in May.

He said: "He was really special to me and it was quite a profound experience for me working with him for reasons that are actually quite difficult to quantify. He was amazing."