Remember, according to a real life test case, in English and European law your human rights don't include attending monarchist parades dressed as a zombie, no matter what bizarre fancy dress the monarchists are wearing.
And now the Home Office is directly intimidating potential protestors by sending them threats about new legislation: "the government are using a statutory instrument to bring draconian measures that the House of Lords threw out of the bill back from the dead, once again evading scrutiny and accountability. It’s worrying to see the police handed so many new powers to restrict protest, especially before a major national event. When the Police, Crime, Sentencing and Courts Act came into force, the police repeatedly misused them".