The Civil Defence Corps existed for a couple of decades after WWII
https://en.wikipedia.org/wiki/Civil_Def ... 0personnel.
The significant thing from my POV was that it was disbanded in 1966 and its functions were transferred to the police which I joined in 1967. So, war duties were included in our training, both theoretical - explanations of things like fallout and electromagnetic pulse (EMP) - and practical. For the practical, Leeds City Council had kindly fenced off an area of housing designated for slum clearance left it standing which we inherited from the Civil Defence, complete with meeting hut. One skill (?) I learned was using a bucket of water + stirrup pump to extinguish a fire. We were told IIRC that this was to deal with incendiary bombs but before clever dick me could point out that incendiary bombs were tackled with sand heaped on with long-handled shovels, somebody asked what size nuclear bomb could be neutralised with a stirrup pump. It was the mismatch between the public information films we had seen, advising the public to whitewash windows and build a shelter under the dining table, remembering to take a torch, portable radio + batteries for both, and the stuff we had been shown illustrating the devastation of Hiroshima and Nagasaki.
With promotion came the week-long regional war duties courses every four years. One perennial presentation came from the Army's educational corps.
https://en.wikipedia.org/wiki/Royal_Arm ... onal_Corps
The speaker was always a captain and the script was always the same, even if it was a different captain. A version of what Ossie posted earlier, the main point being that once the Red Army launched its armoured charge from East Germany, it would reach the North Sea within days in spite of all those NATO troops stationed in West Germany. Put another way, it was a broadly similar scenario to the German invasions of Europe in WWI and WWII. When it came to questions, my suggestion that the Red Army and Russians more generally might fall back and hunker down was summarily dismissed. As I've already posted, none of the speakers from the armed forces were there for my last war duties course and I see the education corps was downgraded (?) in 1992. The "Peace Dividend."