Here are a couple of videos from the British government’s Protect and Survive series:
Here is the Wikipedia entry about the campaign:
Protect and Survive is a public information series on civil defence produced by the British government during the late 1970s and early 1980s. It is intended to inform British citizens on how to protect themselves during a nuclear attack, and consists of a mixture of pamphlets, radio broadcasts, and public information films. The series had originally been intended for distribution only in the event of dire national emergency, but provoked such intense public interest that the pamphlets were authorised for general release. Following the government’s abandonment of its nuclear civil defence policy in the 1990s in response to the altered geopolitical situation, it was tacitly acknowledged that Protect and Survive had little real value beyond providing the public with something ostensibly positive to focus its energies on in the last days before a nuclear war, thus theoretically minimising civil unrest.