The Queen is in theory the fount of Justice and all Justice is carried out in her name. In their coronation oath monarchs of the United Kingdom take an oath to uphold Justice and Mercy and the customary laws.
Nevertheless, in modern times, all, but the most ignorant, are aware that a British constitutional monarch accepts laws passed by Parliament. To target the monarch or symbols of the monarchy is unlikely to prompt Parliament to change existing laws.
If I remember correctly, another member/s of this group some time ago staged a 'protest' by climbing the facade of Buckingham Palace.
Responses are not allowed!