By law you must tell the police in writing 6 days before a public march if you’re the organiser.
Tell the police the:
The police have the power to:
If you arrange a march at short notice, you must still tell the police as soon as you can.
The police can also:
If there’s no march organised as part of your protest, you don’t have to tell the police.
Don’t include personal or financial information like your National Insurance number or credit card details.