Veteran Richard Inman, who claimed to be “with Tommy” for around 7 years, claimed Robinson was arrested by Kent Police at a port as he planned to go away “for a couple of days”. “We don’t know where he is, we don’t know what’s going on,” he added.

Kent Police would not confirm if they had arrested Robinson. It is understood the force does not comment on individuals under investigation unless they have been charged. The Metropolitan Police said there was “no Met involvement” in reference to the post about Robinson’s arrest.

On Saturday, Robinson played what the media are calling a “libellous” film to thousands of protesters gathered in Trafalgar Square. Robinson broadcast a one-hour 45-minute “documentary” about a legal battle between himself and a Syrian schoolboy on large screens at a march in central London.

He is already due before the High Court on Monday accused of contempt for making the “documentary”, called Silenced, as well as for breaching an injunction against him banning him from repeating claims made in the film.

In 2021, he was ordered to pay Jamal Hijazi £100,000 for allegations he made about the Syrian refugee after a video of him being attacked at his Huddersfield school went viral. The claims, including that Mr Hijazi had been attacking girls in his school, were repeated in the documentary.

In response to a complaint about the film on Twitter on Saturday evening, the Met said: “We did not know what films would be shown during the event. Organisers of protests are not required to share those details in advance. There is no power for us to compel them to do so.

“Officers on duty for the event couldn’t reasonably have been aware of civil proceedings ongoing in relation to a particular film, but having now been made aware we’re making further inquiries to determine what action we need to take.”

Thousands of flag-waving demonstrators turned out for Saturday’s march, where they were heard chanting “We want our country back” and singing Rule, Britannia! As crowds watched the film, Robinson posted on Twitter: “I’ll be jailed for two years for showing the inconceivable truth.”