I have a large BCF/Halon extinguisher that I acquired during my service with the LFB. They were very good at extinguishing car fires and also fires in post boxes without damaging the contents. They can also be used on chip pan and oil based fires and electrical fires, they work very well.
Unfortunately you cannot get them anymore because of the detrimental effects they were supposed to have on the atmosphere, not sure if there is an alternative. You have to know what you are doing with them however because in certain circumstances they can give off phosgene gas.