Benedict Cumberbatch: David
David : [tearfully to Dawn] I want you to be happy.
David : One of my students is cutting herself.
Dawn : How do you know?
David : She told me. Such a shame, she's a bright kid.
Dawn : You have to report it.
David : I don't want to get into trouble. With her family, I mean.
Dawn : You have to tell someone, David, it's the law.
David : Yeah, well. Social services, bit of a mixed bag. Trust me.