There exists a large number of photos detailing a Civil Defence exercise that took place in Fulham in 1941. The photos are part of a series called The Reconstruction of "An Incident". Many of the photos are available on the IWM website. However, I keep coming across photos relating to this exercise which I had not seen before. This photo shows an officer in the Control Centre updating the Damage board. Of interest is the CONTROL shoulder title on his bluette overalls. You don't often see shoulder titles on overalls, and seeing CONTROL ones is quite rare.
News about interesting insignia, ARP related info and period photos that turn up.