"As an actor – I’d been an actor for many years before I did Doctor Who – you have an effect on an audience. You hear them laugh, you hear them cry in the theatre, or every now and again if you do a telly or a film, you bump into someone in the street and they might say something nice. But working with the fans and meeting them all around the world, they come to you and tell you that ‘you got me through my childhood’, ‘I had an unhappy childhood but Doctor Who was there for me’. I’ve met scientists who said ‘I became a scientist, I became a doctor because of you and Doctor Who’ and you think ‘wow, I was only trying to learn the lines and not bump into the monsters’. I didn’t realise that there was this other effect. So it’s very touching, moving and humbling. I’d say that."