I did an A Level in Theatre Studies and had a really inspirational teacher, and then I just went on to university.
My first acting experience was a non-speaking role as a robot. My costume was a cardboard box covered in tinfoil, but I was so shy I refused to go on stage.
I always knew that the only thing I wanted to do was act, but it took me a long time to say it out loud to anyone, let alone myself. I am surprised by how dogged I have been in wanting to make a living as a respected actress.
I am not posh. I went to a comprehensive school.
Schedules on TV are so tight, and it feels like they get tighter and tighter with every passing year. The idea of asking where your character's come from or where they grew up - you would just get a little bit laughed at.
You know that book 'Quiet: the Power of Introverts in a World That Can't Stop Talking', by Susan Cain? That's like my manifesto. The older I get, the more I think I could be a hermit.
My principal at RADA once told me, 'You'll know you're a professional when you don't feel like doing it but you have to do it.'
I've been thinking recently about all the qualities you need in order to be an actor. First and foremost, you've got to have a thick skin and give out an 'I don't give a monkey's what you think' kind of vibe, while at the same time really caring what everyone thinks. You've got to be tough and sensitive at the same time.
After filming, I can't wait to shake off all that '50s primness. I'll go out to a gig and dance ridiculously. I love to lose myself in music. Just letting go - it's dead important.
I hadn't realised what an institution 'Doctor Who' is.
I find that women want to tell me about their birthing experiences. In the most excruciating detail. It's not put me off having children, but I do feel like I know too much.