This instrument would have detected any nuclear explosions and estimated the size in megatons. It was known as A.W.D.R.E.Y., which stands for Atomic Weapons Detection Recognition and Estimation of Yield.

If a nuclear blast had occurred in the UK, only around three or four million people would have survived and prospects would be grim, according to Mike. Temperatures would drop to between -20ºC (-4ºF) and -40ºC (-40ºF) and there would have been no harvest for at least three years. The first would have been burnt off by the flash or the cold weather. Survivors would be too lethargic and radiation levels too high for the second. For the third, you’d have to scrape away the contaminated soil and sow by hand any seeds that you hadn’t already eaten.

Tour the massive government nuclear bunker hidden beneath this man's farm