Two Irish brothers attempt to become global rock stars but can only look on as old school friends U2 become the biggest band in the world. Narnia's Ben Barnes and Robert Sheehan play the warring siblings whose fractious relationship is exaggerated by the explosive popularity of classmate and benign rock god Bono (Martin McCann). The Likely Lads and Auf Wiedersehen Pet writers Dick Clement and Ian La Frenais concoct a diverting tale notable for a scene-stealing show by Peter Serafinowicz as the boys' spaced-out road manager.
Bono performs quite an impressive feat as a sort of global head boy, swanning around the world righting wrongs and lecturing those less morally enlightened what their ethical imperatives should be.
So it must have been a right pain to have gone to school with him.
Brothers Neil (Barnes) and Ivan McCormick (Sheehan) launched their bid for global rock stardom while attending the same school as Bono - then known as the more prosaic Paul Hewson - who had his own plan for world domination.
However, while the newly-christened U2 rocketed into the musical stratosphere, Ivan and Neil's combo found themselves on the traditional rock'n'roll treadmill of transit vans and damp Victorian halls.
The real-life music writer Neil McCormick's wry memoir I Was Bono's Doppelganger has been adapted by comedy stalwarts Dick Clement and Ian La Frenais into a familiar tale of a band's life on the road. With added Bono.
The U2 frontman - or a sweet-natured approximation of him - rocks up every now and then to perform some minor kindness but the movie's two-hour running time is mainly devoted to the bickering brothers.
Neil comes across as a selfish non-achiever who cheats on his girlfriend, vainly passes up on the chance of supporting U2 in front of 500,000 and neglects to tell his brother that a teenage Bono inquired if he was available to join the ranks of his fledgling outfit.