Up to 150,000 people are thought to have descended on London to hear Tommy Robinson and a number of his like-minded guests – including Elon Musk – speak.
An outbreak of violence was perhaps to be expected as their followers fought with police separating them from anti-racism protesters in Whitehall.
But it was the overall scale of Saturday’s Unite The Kingdom rally that clearly took the authorities by surprise.
So how significant a moment was this for the far right? And what are the repercussions for Britain and our politics?
Our correspondent John Ray was on the ground at the march and tells Daniel Hewitt what you need to know.
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