By law you must tell the police in writing 6 days before a public march if you’re the organiser.
Tell the police the:- date and time of the march
- route
- the names and addresses of the organisers
- limit or change the route of your march
- set any other condition of your march
If you arrange a march at short notice, you must still tell the police as soon as you can.
The police can also:- change the location
- limit how long a rally lasts
- limit the amount of people who attend
- stop a sit-down protest if it blocks road traffic or public walkways