During the director/actor commentary of Amazing Grace Benedict was mentioned a few times.
Michael Apted (MA): ...Benedict Cumberbatch, this is his first really big role, and what was so interesting, meeting him, was just like Wilberforce comes from a trading community, it was important that William Pitt came from nobility, and as soon as Benedict walked in, you knew,
Ioan Gruffudd (IG): Immediately. Yes, he has that sort of quality about him.
MA: He has class.
IG: Absolute class. Classy guy. Absolutely.
MA: It's hard to act that sort of stuff. So when I was doing all this casting, it was sort of crucial to me who actually had that innate breeding.
MA: Did you enjoy working with Benedict?
IG: I loved working with Benedict. We had a wonderful time. It's so important to have that relationship formed, so we did become very, very good friends. We see each other quite often, now.
MA: Did you work the same way?
IG: I think we do. I don't want to comment on his sort of process, but I think we both work, I mean, sort of from the outside in. I wouldn't necessairly call us both two method actors, you can't really...