Speaking to the Guardian, Murton said: “I don’t see how anything I was wearing, how anything I was displaying, anything I was saying, could be deemed as supportive of the proscribed group.

“It’s terrifying, I was standing there thinking, this is the most authority, authoritarian, dystopian experience I’ve had in this country, being told that I’m committing terrorist offences by two guys with firearms.

“I ended up giving my details, and I really resent the fact I had to do that because I don’t think that was lawful at all.”