Even though one of them is about an Edinburgh junkie and ones a little boy of eight in Manchester, you want them to always portray their world in such a vivid way that the audience can disappear inside the story.

For us, destiny always feels... if you obey, it's almost a passive thing.

There's lots of things that can be solved with cash. And there's occasional things that can't be solved with cash, which become a bureaucratic nightmare for some reason, and there's no distinction between the two. There's no way of reading a situation and saying, "Yes, that'll be a bureaucratic nightmare, but that one we'll be able to buy off." It just depends on the day, apparently.

When you're in zero gravity everything moves at the same speed and nothing stops it. If you throw something it travels forever but it still travels at the speed you threw it at. To make it plausible, movies have chosen to show it in slow motion.

Actors want to impress at the beginning, so you take advantage of that by suddenly saying, 'Right, you're here for two weeks.' What you're doing is creating a siege mentality.

To force yourself out of the comfort zone, the main ingredient is trying to work in a world where you haven't been before, that you don't know the rules of. And that involves a lot of research, so you begin to see where the other people have been, but you are starting from as vulnerable and as low a point as possible.

One of the things in the Mary Shelley [Frankenstein] is that the creature tells his story, so this begins with the creature's point of view. So, it literally starts with the creature opening his eyes and is born - but is obviously in his 30s. But because they're the creator and the created we thought it would be really interesting if they could look at each other every other night and play each other's roles.