If the United Kingdom had been attacked in a nuclear war in the 1970s, here's some of the prepared script the BBC would have broadcast to flesh-melted Brits :
This is the Wartime Broadcasting Service. This country has been attacked with nuclear weapons. The number of casualties and the extent of the damage are not yet known. Stay tuned to this wavelength, stay calm and stay in your own homes.
Radioactive fallout is many times more dangerous if you are directly exposed to it in the open. Roofs and walls offer substantial protection.Apparently, the BBC had a lot of trouble trying to decide on the right, calming, reassuring voice to tell Britons that their cities have been razed in a blinding flash of light.
Make sure gas and other fuel supplies are turned off and all fires are extinguished.
You should refill all your containers for drinking water after any fires have been put out, because the mains supply may not be available for long. Until you are told that lavatories may be used again, other toilet arrangements must be made. Water means life. Don't waste it.
Ration your food supply, because it may have to last for 14 days or more. If you live in an area where a fallout warning has been given, stay in your fallout room. When the immediate danger has passed, sirens will sound a steady note. The "all clear" message will also be given on this wavelength.
Do not go outside the house. Radioactive fallout can kill.
We shall repeat this broadcast in two hours' time. Stay tuned to this wavelength, but switch your radios off now to save your batteries until we come on the air again.