Not far from a camp in Dunkirk where hundreds of asylum seekers sleep, hoping to cross the Channel to the UK, are some chilling pieces of graffiti. There is a hangman’s noose with a figure dangling next to the word “migrant” and, close by, another daubing: a Jewish Star of David painted in black surrounded by red swastikas.

Utopia 56, a French group supporting migrants in northern France, posted the image on X on Christmas Day with the comment: “This is what comes from normalising the extreme right’s rhetoric, a visible, unapologetic, unabashed hatred.”

It is not known who was responsible for the graffiti. But one thing is clear: it comes after a period of growing activity on French soil by far-right British activists, some of whom have harassed and intimidated asylum seekers in the places where they sleep, or boasted of slashing dinghies to prevent crossings. And to many of those who work to support asylum seekers in northern France, that activity has been hothoused by the rightward shift of mainstream British politics.

"The reason why they’re coming out and doing this stuff is because they’re emboldened,” said Lachlan Macrae, of the group Calais Food Collective. He said his group had found water containers stabbed, or with soap poured in to render the water undrinkable. “They come with bulletproof vests and they go on to the beaches. They’ve been harassing people and streaming this content. As the ground is ceded to the far right, the far right has grown in response. Far-right groups in Calais are the norm now.”