"Not Only But Always" is a biographical drama that follows the lives of the iconic British comedy duo, Peter Cook and Dudley Moore. The film explores their rise to fame in the 1960s and their tumultuous relationship both on and off the stage. Through a series of flashbacks, viewers are given a glimpse into the highs and lows of their partnership, from their early success to their eventual falling out. As they navigate the pressures of fame and the complexities of their friendship, Peter and Dudley must confront their own personal demons in order to find a way forward. Ultimately, "Not Only But Always" is a poignant portrayal of two comedic geniuses who left an indelible mark on the world of entertainment.