The Chamber Orchestra of London is a contracted session orchestra made up of professional musicians from the greater London area and beyond, brought together for recording purposes. The group's growing list of credits includes The Crown and Downton Abbey television series, two movies in the Harry Potter film franchise, and two installments of the Halo video game franchise, among many others. The Chamber Orchestra of London has regularly performed the film music of composers Daniel Pemberton (Steve Jobs, The Trial of the Chicago 7) and Benjamin Wallfisch (Hours, Serenity). The orchestra teamed with John Lunn to perform his music for the soundtrack to Downton Abbey: A New Era in 2022.