I manged to pick up some copies of the Civil Defence Journal - ARP & NFS Review. I've seen copies on eBay a few times but the below looked to be of keen interest for this blog. The magazines cover a wealth of Civil Defence news as well as copious amounts of adverts aimed at CD / Fire Brigade workers. Having the whole series would make for an excellent resource.
The introduction makes it clear how different the use of insignia within the Civil Defence Service could be:
"In Civil Defence the discretionary power vested in local authorities means that considerable variations are to be found; two men, of equal rank, on either side of a street forming a regional boundary may have different rank markings."
There is also some excellent information on helmet markings.
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