An interesting group portrait from an unknown location. Interesting to see they adopted the white 'W' on a black square on a white helmet. Not overly rare but interesting to see a lot in one photo. Although the quality of the photo is not great, the senior officers in the centre appear to have additional markings about the 'W', possibly the rank diamonds that were used in the early part of the war.
News about interesting insignia, ARP related info and period photos that turn up.