Historical comedy-drama Their Finest is an affectionate ode to morale-boosting British Ministry of Information films of the second world war. Gemma Arterton stars as a young copywriter who is brought in to work on a film about the Dunkirk evacuation, while Bill Nighy is a fading matinee idol hoping for one last star turn. The pair discuss the role played by women in the war effort, the timely nature of their film and the challenges of doing a Welsh accent.