The duo broke up at the same time as Allen's marriage to Liza Minnelli and Chris Bell went to America and formed a touring band called Boomerang in the 70's .
Henderson made the Allen Brothers a regular act on the show, gaining them national popularity and providing networking opportunities such as their future close working relationship with Olivia Newton-John.
Moreover, the duo played a regular support role for the American performer Frances Faye at a Sydney nightclub called Chequers.
During their performance at the Hilton in Hong Kong, The Allen Brothers were spotted by international superstar Judy Garland who subsequently became their permanent manager and allowed them to open for her in her London concerts.
Whereas Chris Bell quit the music industry after the duo split, Peter Allen went on to have an extensive solo career.