I think that anyone with pictures of this kind of placard, whenever they were taken, should go to the police local to where it happened, make a complaint, and copy it both to the police minister and the shadow police minister. That way, HM opposition can do their job of holding the government to account to hold the police to account, to get this type of behaviour dealt with. Maybe this will also help address the ‘both sides’ narrative.
Longwinded, but…