You can finish the day's filming or the whole shoot or watch something months later and think you could have done it so much better. It's frustrating.

My family weren't actors, and we didn't know any actors. It wasn't even something I was aware you could do as a job. I thought you had to be a Redgrave or a Barrymore before you were allowed to go to drama school.

It might be quite boring if you did something and thought it was perfect.

Acting was a slow-burn thing. I found it was something I really, really liked doing, but it wasn't until my third year at drama school that I actually thought, 'Oh, right, I'm trained for this now; I'd better see if I can do it.'

I've never, ever done a piece of work - and can't imagine doing a piece of work - when I've thought, 'I was pretty perfect in that.'

I've enjoyed all the work I've done, and I feel quite lucky that I haven't been playing sweet girls all the time.