Around 4,000 officers are expected to be on duty on Saturday for the ‘Unite the Kingdom’ and Nakba Day marches Get the free Morning Headlines email for news from our reporters across the world Sign up to our free Morning Headlines email Sign up to our free Morning Headlines email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice London is bracing for an "unprecedented" policing operation this Saturday as the capital