I know what I want. I try and convey that at the beginning and set that out, but within those parameters, I'm very happy for them to experiment and try things and give it a go. To me, it's important.

I think improvisation is really crucial in terms of making things feel real and authentic.

It's tough to make funny films. And the truth is, with this process, especially if you write your own movie, then you're giving three years of your life to it. And so, I just have to be sure that when I embark on it that I'm happy to think that in three years' time I'm going to be sitting in a room on the tenth floor of an odd office building at Ginsberg Libby talking about it. So I'm keen not to jump into it too quickly and just make sure it's something that I really want.

With directing, your day is done. When you hit seven o'clock, it's "Cut." That's what it is. For better or worse, that's what you've got and you have to make that work, and there's something incredibly liberating about that because you can't torture yourself. You have to focus on the moment, and you have to embrace every second and opportunity and maximize that, whereas with writing, there's no imperative there. You just amble along.

It's incredibly easy as a director to be egotistical. Of course, it is because you have 200 people on set every day listening to your every word and whatever you say goes, and that can be slightly corrupting. And actually, to be a good director, you have to take ego out of it, because hopefully what you've done is surrounded yourself with brilliant people. Let them be brilliant and you just shepherd that and marshal that and hopefully guide it however you can, but definitely not to the extent that you're overbearing.

I think actors like to be directed. Actors like to know where they're headed and what they want, so I'm very encouraging.

I've been on lots of film sets. I've produced films and written films and been around, so it wasn't my first rodeo in terms of that stuff. Nothing particularly surprised me, I have to say. I came in and I enjoyed the first day and I enjoyed the last day.