You, personally, could make a complaint of assault and criminal damage. Yes, the police are busy, but it is exactly the type of thing that we're (says me, speaking the entire service I'm sure) here for. As a patrol officer in a largish southern English town over the last couple of years I've personally dealt with three physical assaults on ambulance crew, and a verbal assault (drunkard climbed into back of an ambulance insulting crew as they treated a patient, and refused to leave when asked nicely several times). None of the assaults had resulted in any injury beyond a bruise - yet positive action was taken and arrests made. The CPS were very supportive - explicitly stating the ambulance crews are public servants placing themselves in danger and particularly deserving of protection. The law of assault and criminal damage is the same all over the country, and the National Crime Recording Standards mean that there is a duty on the police to at least record stuff like this so that we have a true idea of what is happening so that our leaders can (theoretically) take account of it when deciding future resourcing. I know it might be a pain in the backside - but make a crime report to the Met. Let me know if you need further details on how to do this.