Among the orchestras he conducted were The London Schubert Orchestra (founded by George Schubert, Brockless was musical director), the English Chamber Orchestra, the Royal Philharmonic Orchestra, Philomusica of London, Northern Sinfonia and The Royal Philharmonic Orchestra.
Among the orchestras he conducted were The London Schubert Orchestra (founded by George Schubert, Brockless was musical director), the English Chamber Orchestra, the Royal Philharmonic Orchestra, Philomusica of London, Northern Sinfonia and The Royal Philharmonic Orchestra.