The outcome of that case will define whether Palestine Action remains banned. If the ban falls, then the 700 arrested so far are free - their cases would collapse. As for the group itself, it may feel emboldened - but would know that it could still be banned again if its actions cross the terrorism laws line.

Critics say ban on activist group stifles freedom of speech and assembly and aims to curb pro-Palestine demonstrations.

Officers made arrests after crowds, waving placards expressing support for the group, gathered in Parliament Square.