The personal story of legendary comic duo Peter Cook and Dudley Moore. Publicly, the partnership of Peter Cook and Dudley Moore was a riotously funny double act that re-defined the art of comedy for the second half of the 20th Century. Privately, the duo's creative relationship was fraught with tension and resentment. A platonic love story between two shining talents, Not Only But Always, a drama starring Rhys Ifans in his first major television role, spans three continents and 20 years to bring the moving tale of a magical and hilarious on-stage chemistry to life. From their first meeting as undergraduates in 1960, through their beginnings on Beyond the Fringe, the drama follows their infamous journey from the glory days of the heady 60s to their bitter and rancorous split during the recordings of Derek and Clive, and their attempts at reconciliation before Cook's death in 1995. From Private Eye, to 10, the Establishment Club to Arthur, the film covers all the key moments in the extraordinary real life story of the godfathers of modern comedy.