We were very careful, I think. Having known Doctor Who all my life, literally since I was three years-old, I know its borders very well. So there was never anything the BBC said “You can’t do that,” there was never anything that I felt constrained by. I mean, a lot of the rules I imposed myself. There’s no blood; in very, very rare instances do we see blood. There’s not a BBC guideline on that, that’s mine. That’s saying, “It’s wrong for the show,” and prolonged suffering, and things like that. You know, there’s things– It’s great to give children a scare and a thrill; there’s a line which you cross where it’s not clever to damage children and to give them nightmares and traumas that might last beyond the narrative. It’s just common sense.