The Brexit stalwart wants to write a book about the so-called “Farage theory” when he hangs up his political boots.
Some of his critics believe that might come sooner rather than later, and the passion displayed on Thursday might do little to placate such speculation.
Mr Farage’s argument centres on how the Allies could have thwarted the rise of Adolf Hitler by continuing the fighting for another six weeks, echoing warnings he attributes to US General John Pershing.
His theory is that the Armistice came too early, allowing the German military to avoid the decisive defeat which might have prevented the later myth that its soldiers had never really been beaten.
He argues that this, combined with the punitive terms imposed at Versailles, helped create the conditions in which National Socialism could flourish.
But he is also acutely aware of the terrible human cost of the alternative, with British forces suffering around 1,000 deaths a day in the final weeks of the Great War.
He believes, however, that driving German forces back across the Rhine could have prevented the rise of Hitler, the Second World War and the deaths of as many as 100 million people.
It is an extraordinary price to contemplate after more than four years of slaughter.
Other uncomfortable topics are raised, too, including the treatment of soldiers shot at dawn after suffering from shell-shock and the imprisonment of thousands of conscientious objectors.
Ultimately, however, the documentary is about bringing people together.
Mr Farage is about to make his first appearance at the Cenotaph for Remembrance Sunday.
“I’ll be very honoured to represent the party at the Cenotaph on Sunday,” he said.
“And it’s something that will mean a lot to me personally. It really will.”
His absence in previous years has fuelled arguments about the political establishment, including from within Reform.
But this year appears to demonstrate Mr Farage’s pride rather than any political grievance.
“I’d like to think in some way this story could be used in modern Britain as a bit more of a unifier, that there is a collective sense of shared history,” he said.
And perhaps that is the most revealing insight of all.
Mr Farage has often been defined by what he wants Britain to change.
But this documentary is about what he believes Britain must never forget.
For a politician who has spent 35 years arguing about the country’s future, and warning about its decline, there is something rather revealing about seeing him so absorbed in the lives of those who shaped its past.
The message of his documentary is a powerful one.
It is about the remarkable stories of ordinary people who, through their courage, sacrifice and extraordinary deeds, gave us so much of what we have to be proud of today. They are the people whose lives shaped this country’s history, and whose stories deserve to be remembered by this country today.