 In 1926 Jackson moved to London, where he played in cinemas and for the BBC Wireless Orchestra and later in theatre orchestras for productions by C B Cochran and Oswald Stoll.He began to secure ad hoc engagements with symphony orchestras, and in 1932 Sir Thomas Beecham appointed him principal flute of the new London Philharmonic Orchestra.After a year with Beecham, Jackson was offered better terms to move to the BBC Theatre Orchestra, where he played for four years, transferring to the BBC Symphony Orchestra in 1937.