Una Bart was a pianist at Ealing Studios, working as pianist on Ealing films. Later she became an assistant to Ernest Irving, who was a conductor and composer at the studio.  As a composer she wrote the song ‘Arf of Arf and Arf’ for the film Champagne Charlie (1944) as well as the song ‘Dancing in the Dilly’ for the film Out of the Clouds. She also played the Infant Phenomenon in Nicholas Nickleby (1947).