An interesting photo of a First Aid Party (FAP) at work. Most likely a staged photo is shows a casualty being readied for a waiting ARP ambulance (theirs the ambulance driver on the back of the vehicle with 'A' on their helmet). Of interest in the helmet insignia of the person in the middle. The large diamond above the FAP letters signifies the person as the Party Leader (they also appear to have two chevrons on their sleeve). There's also a gentlemen at the front of the stretcher wearing gaiters which are not often seen worn.
News about interesting insignia, ARP related info and period photos that turn up.