In 2010 Northover made his feature film debut in the hard-hitting AIDS drama House of Boys opposite Stephen Fry and Udo Kier, shedding 40 lbs to play the film's lead character, a young street hustler living with AIDS in the early 1980s. The film went on to receive several international awards. Northover then appeared in the 7th installment of the Harry Potter franchise, Harry Potter and the Deathly Hallows. In an interview with Paper Magazine, he described his experience on the production as "the biggest machine I have ever encountered."
