Hundreds of thousands of people will on Saturday take part in “Stop the Coup” protests against Parliament’s suspension in demonstrations orchestrated by a hard-left militant who once branded Remembrance Sunday "insidious".

Organisers are calling on protesters to “occupy bridges and blockade roads” in more than 30 cities across the country. The largest protest is expected in central London with vast crowds descending on Downing Street at noon on Saturday.

The demonstrations are being organised through social media by Another Europe Is Possible, a campaign group founded and is run by Michael Chessum, a Momentum activist who describes himself as both “hard left” and “hard remain”.

Mr Chessum, 30, said yesterday that “disruption is the only form of leverage protesters can rely on” and added: “We would go further than anticipate (civil disobedience). We would defend it.”

Mr Chessum is a controversial figure who when he was president of the University of London students’ union decided to boycott Remembrance Sunday because “we regarded the ceremony as a political statement”.