Far-right group English Defence League (EDL) will protest outside Parliament today.
The EDL originally planned to demonstrate in Walthamstow, but the MET Police banned all marches there for 30 days.
EDL says it's a movement opposed to Islamic extremism, but critics say it's racist.
Waltham Forest Councillor Chris Robbins says the ban "is a victory for the ordinary residents."
But EDL has told the police it will try to stage more protests there once the ban is lifted.
More top news
Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.