A script written by the BBC and the government to be broadcast in the event of a nuclear attack has been published.

"The script, written in the 1970s and released by the National Archives, included instructions to "stay calm and stay in your own homes".

It said communications had been disrupted, and the number of casualties and extent of damage were not known.

Other papers reveal debates about how to ensure the person reading the script was authoritative and comforting.

The script was discussed from 1973 to 1975, during the Cold War."