Rose Byrne: “Rafe and I really hit it off easily and became friends and we have a similar sense of humour. It’s funny though, I also think that how you get along in real life doesn’t really always have a bearing on how you’re going to look on screen anyway, because you hear stories of co-stars who are at each other’s throats but on screen they have a fantastic chemistry.

“Or then you see married couples who do films together and they have no chemistry on screen, so it’s very random. The camera tells such a different story, I think. But it did make for a good working environment which is always better than a bad one [laughs].”

Dan Mazer: “We were very keen that there was a chemistry between them but then you realise that there does not need to be such a strong chemistry. At a certain point I had to dilute it, because Rafe and Rose got on incredibly well, loved each other’s company and had real fun on set together.

“We didn’t want to see that sparkle too much however, which was one of the challenging aspects of the film. You have this couple that get together at the beginning and from the very start you have to want them not to be with each other, which is a difficult line to tread without making it poisonous between them. It was a tough balance to strike.”