I think it's amazing to have one writer write every episode of a series. It's very rare, I think. You get a voice that continues.

I was lucky, I had support from Mum and Dad - they said as long as you work hard, anything is possible. I never thought past those two things - that I liked living in imaginary worlds and that it is possible to do that for a living.

Tone is always such an important thing, and that's achieved through a multitude of people. It comes through the writing, it comes through the way it's shot, and it comes through the production design and the sound design.

The story revolved around this universal identifiable fear that we must all have, at some point, when you commit yourself to being with another person, to have and to hold until death do us part. It's a huge thing. I just felt like it was a brilliant examination of what would happen, if the person that you trusted implicitly and thought you knew every follicle and pour of, inside and out, started to not be that person anymore, inside. Physically, they're still there, but they're not there mentally.

Weirdly, some of the middle stuff of the descent into something going wrong were the hardest, tonally. You don't want to jump the gun and be instantly paranoid about the fact that she has made coffee wrong because that would be weird. It's the slow build and letting it sink in. If they say everything is okay, you believe your partner. You don't want to rattle the boat too much on your honeymoon.

I think it's amazing to have one writer write every episode of a series. It's very rare, I think. You get a voice that continues.

Personally, I just want to work on stuff that challenges me, that excites me, and that I think is original. You want to do something that does to other people what films do to you. It's the most wonderful thing in the world when you can lose yourself from reality and go into a story, and believe it and go on that journey with people, and you have to work that will somehow do that. It won't always, but hopefully sometimes.