Catherine Tate’s beloved character Nan makes her cinematic debut in a thrilling journey from London to Ireland alongside her grandson Jamie, aiming to reconcile with her long-lost sister Nell. Along the way, they encounter radical vegan activists, boisterous rugby players, all-night parties, and wild police officers on motorcycles, creating a truly eventful adventure. This origin tale intertwines Nan’s current escapades with her past, revealing the experiences that shaped her into the irritable old woman she is now.