Firth - all dodgy 'tache and frantic eyebrows - has got the sexual allure of a man who runs a swingers' club in Surbiton.

I don't think it's aiming at gags, I think the humour is woven into it. It's part of how the characters operate and how they deal with disaster because they're worldly enough to have a bit of irony and wryness about their own circumstances. So, I think the humour comes out of that.

My primary instinct as an actor is not the big transformation. It's thrilling if a performer can do that well, but that's not me. Often with actors, it's a case of witnessing a big party piece but wondering afterwards, where's the substance?

I think the dictator director is based upon stories from the past. I don't think anyone would put up with it now. There are a lot of people on a film set with egos. So, to be completely authoritarian, you'd probably have to have a reputation like Kurosowa or somebody to get away with it.

Sometimes to think about why some institutions are stable, it's interesting to go one generation back and look at the author of that stability.

'La Dolce Vita' made we want to go to Rome and, if not jump into the Trevi Fountain, at least watch someone else do it. Maybe that's why I married an Italian...!

I find that at almost every press junket I get that comment, "this character's different from what you generally play..." And that's OK! But I think "generally play" stems back to Mr Darcy. I'm fine with it but I tend to find that if it's a departure, which in other people's words it always is, it's always a departure from that.