There has been some trouble in Auchinleck, East Ayrshire. This is described:
Det Insp Louise White of Ayrshire Division said: "An investigation is under way following an incident of large-scale disorder in Auchinleck on Saturday, 25 November. Officers were called to reports of a crowd gathered in Old Avenue.
"The crowd moved to other addresses in the area and public order officers attended to assist when the crowd refused to disperse when requested.
"Unfortunately during the incident some of those gathered became extremely hostile towards the police and one officer was struck by a firework and taken to hospital for treatment."
What does it mean that the police "requested" the crowd to disperse? Does making/refusing a request, which would usually refer to an optional thing, put any requirements upon the subject, or give any powers to the police? In particular, do the police need to do something other than "request" before they charge in which shields and weapons?