The actor admits it’s something he had to work at, and cites his role in Circus as his turning point:

“I learned, there’s a film called Circus, I was offered this rather flash character. It was a great script, which I don’t think we landed, I don’t think it was handled right, and came out not as good as it went in. David Logan wrote it. Everyone was lying to each other, there was so much lying going on, I loved it. My character had four scenes, one of which was cut out, and of the three scenes, I filmed one of them, and that was bad, I did a bad job of that. I did the second scene, which I was OK in, I think, and I went back and they did an assembly, and they showed the assembly to cast and crew, I saw my first scene and I thought, ‘I don’t believe me, I’m not doing anything, I’m not committed to anything, there’s no attitude, I’m not driving anywhere, I’d better get it right’. So the third scene I did, which I think comes out – might have come out second or first, it might be the first scene that you see – that’s where I learned how to act. That’s where I began to turn. And after that, The Richesreally helped me, because it was 45 minutes of drama shot every seven days, that’s an incredible speed, so you’ve just got to get on the rails and do it, and in the end, for most things, the more we do something, the better we get at it. So I just had to keep going back when some reviewers, logically, I haven’t read them all, but I assume they would have been – I think I read some of them – going ‘this is not so good’. I do know somebody said “Why is he trying to be a so-so actor when he’s a brilliant comedian?” That was an interesting quote, and the answer is because I used to be a so-so comedian. I’m so-so at everything that I start, most people are, but if you have enough stamina, you can get to be OK, and you go ‘ah, that’s OK’, and then you go, ‘ah, quite good’, and then ‘good’, and now I’m happy with what I did as Bertie, I’m happy with what I bought to the table.”
(via)]]>