Being a child of the 80’s I remember my dad telling me about the four minute warning
Now in my 40’s and with the advent of the Internet it’s pretty easy to learn more about the entire subject and even visit these previously top secret bunkers and systems.
Topics that interest me are Underground bunkers and communications systems.
I live in Newport Pagnell and as a kid we always knew about some ‘secret’ thing at
Chichley hill, I was only told its something to do with the military -
The four minute warning would be triggered nationwide by either radar stations at RAF Fylingdales
or should of that failed, after a bomb had landed by detection at one of the 1500 ROC monitoring posts.
There is an extensive description of the entire “4 minute warning system” at this excellent site
The next three pages shows the cold war bunkers that I have visited: