When I was at drama school, I wanted to change the world, and thought I had some great wisdom to impart to people about humanity. Now that I'm older, I know enough to realise that I know nothing at all.

I think parenthood is a wonderful balancing act. On the one hand, you want to spend as much time with your children as possible. On the other hand, you want to set an example for them to see that you're fulfilled in your life and in your work.

My experience of working on this show, even though there is so much about sex and sexuality, and we find out a lot of facts and statistics that are very interesting, in their own right, I found that I started talking about relationships more, and the emotions, the difficulties and the challenges. So, I became far more open about that, which I think is probably an indication with the show itself.

The first job I ever did in the theatre, I was supposed to be a genius piano player. I couldn't play the piano, but you just sit there at a piano like you're playing, and suddenly all this amazing music comes out and the audience believes you can do it. It's the same with computers. I love scenes where there are people yanking at monitors, "yes I'll put you through now," and you know they're just doing that. But you can look brilliant at all this technology. I love it.

When you're working on something where there's usually one sex scene in the film, it all gets a little bit of a gray area and people get a bit uncomfortable and awkward. You just get through it. But, it became very clear on this that that can't happen. There can't be any gray areas on this because there are actors and actresses coming in for a day or a couple of days, as well as people who are there regularly.

It's interesting that in searching for monsters to play you often end up playing leaders.

On the one hand Twitter gives you the opportunity to engage with people, which is great, but on the other there are people who feel they can say whatever they want, put poison out there, really, without fear of any repercussions.