A selection of quite scarce Civil Defence armbands are coming to auction on January 12 (in Holland unfortunately). Looks to be a number of Rest Centre variations. I've not seen the "Person In Charge" before. Ignore the yellow armband as that is post-war. Not sure about the blue and white check armband - possibly police/post war or, and this is a bit of a guess, Incident Officer related as they had a similar design on flags put up at air raid incidents
News about interesting insignia, ARP related info and period photos that turn up.