AIUI the Protect and Survive films were only ever meant to be broadcast if a nuclear attack was imminent. They were classified but leaked to the BBC. It's not like anyone was showing them alongside the Green Cross Code man, "old fridges can kill", or Charly telling you to keep away from strangers and chip pan fires (separately...).

(I'm reasonably sure the pamphlet didn't get published for the general public either, but again its existence was reported by the media)

EDITED TO ADD: aha, Wikipedia says that the pamphlet did get published, basically because of the reportage generating so much public interest.