Their Finest is set in mid-WWII-Blitz Britain with morale at an all time low. The government decides to produce a propaganda movie about the Dunkirk evacuation to lift the public's spirits - showing 'real life with the boring bits cut out' as the brief reads.

The head of Ministry of the Information's Film Division (Richard Grant) employs a young female copywriter called Catrin Cole (Gemma Arterton) to convey a much-needed feminine perspective to their scripts.

During her interview Cole is casually informed that 'Obviously, we can't pay you as much as the chaps'. She is later cheerily informed by another of her new colleagues that the women's dialogue she has been hired to write is referred to around the office as 'the slop'.

Catrin takes the job out of necessity as her disabled husband (Jack Huston) is a moody artist whose dark industrial landscapes are not selling. They need rent money.

Sent to interview twin sisters who assisted bring back soldiers from Dunkirk, Catrin decides that their story would translate well to the screen.

To help create the movie she is teamed with writer Tom Buckley (Sam Clafin), a hard-nosed cynic who opposes many of her ideas.  

Tom and Catrin constantly bicker about who should be the hero (a man or a woman?) to which Tom finally remarks: 'Girls don't want to be the hero: they want to be had by the hero.'

Ambrose Hilliard (played exquisitely by Bill Nighy whose trademark shtick is highly acerbic) is a worse for wear, pompous matinee star who is cast, to his disgust, as an alcohol-sodden, aged curmudgeon. He originally thought he was being cast as the hero. Hilliard delivers some of the funniest lines with his constantly arched eyebrow and winsome smirk.

He is joined by an American Air Force pilot Carl Lundbeck (Jake Lacy) parachuted into the production for political purposes. At this time the British were desperately trying to convince the U.S. to join in the war effort. Carl is the quintessential American-hero type: golden locks and a million dollar smile.

And so the scene is set for what becomes, in part, an examination of the role of women on the home front by exploiting the comedic tension between these disparate protagonists.

This motley but endearing ensemble skilfully deliver comedy, romantic drama, wartime tragedy and feminist-friendly themes to create a witty and romantic gem. All the actors feel as if they immensely enjoying themselves, and it's impossible not to feel the same way.

Their Finest is a funny, charming and genuinely romantic movie which makes you cry and laugh simultaneously.  

Its premise is undoubtedly: 'Stay calm and keep on filming'.