I noticed the Cardinal Vaughan school in the credits and so I rushed home to check this out in the news. Enjoy.
The film soundtrack features features the Schola Cantorum of the Cardinal Vaughan Memorial School of London, and the London Oratory Junior Choir, directed by Charles Cole. Both of these are Catholic institutions. Among the patrons of the London Oratory as Michael, the Duchess of Kent, and Cherie Booth - the wife of former UK prime minister Tony Blair.