Patrick Malahide is the Principal but of the dance school that Billy Elliot is auditioning for towards the end of the movie. Billy Elliot was a massive deal when it was released as I would remember, so I think it shouldn't be a surprise if he's in the film.
Yeah? I think why he was placed in that scene, maybe tired of being seen going after Arthur Daley, so they got him that role with the lead character working hard for his dream. Actually, no, maybe not.