I've been after a copy of Terence H. O'Brien's History of the Second World War - Civil Defence for several years. It was published in 1955 by the Stationery Office as the official history of Civil Defence in the UK and is a whopping 729 pages. The level of detail is remarkable. The planning for ARP from the 1920s and through the 1930s is particularly interesting. Every area of Civil Defence is covered and for those wanting the chapter and verse on the Civil Defence Reserve I've not read anything better.
My copy was a withdrawn edition from a library and was just £8 on eBay; a bit of a bargain for a book that is quite rare to lay your hands on these days. The first 180-odd pages are available to read on the Internet Archive website.
Send me items to blog about via my contact page