More Dads Army than Saving Private Ryan, this soft-and-gentle wallow in nostalgia fits in comfortably between a meat-and-two-veg Sunday lunch and Songs Of Praise.
Although based on a true story, its mood of fond remembrance feels more like a pensioners tall tale than a realistic report from the frontline. This is war as fought in a jolly English manner, where a grumpy Winston Churchill is affectionately indulged by senior officers, and bumbling heroes take on the might of the Third Reich with bravery and endearing stupidity.