What is Patriot Platform, the far-right group that descended on Dover and Portsmouth?

Campaigners say anti-migrant collective, which gathers together a series of local groups, is home to a host of violent criminals

Hundreds of masked and hooded anti-migrant activists descended on an English coastal town and city over the weekend, blocking traffic in and out of the port of Dover, and gathering in Portsmouth after it emerged a boatful of people had been rescued at sea and brought ashore there.

The far-right group Patriot Platform seemingly managed to plan and carry out its operations unimpeded – despite having been clear it was building up to some form of action on social media. So what is Patriot Platform?