The far-right activist, real name is Stephen Yaxley Lennon, was today acquitted after a judge ruled the power used against him had not been legally authorised by the Metropolitan Police.
Six people were arrested near Downing Street after police intervened when a group broke through a cordon made to stop people moving past the area allocated for the event.
The former English Defence League (EDL) leader is accused of failing to comply with a direction to leave an area in Westminster on November 26 last year.