This is a poster produced by the British government Ministry of Information
in the 1960s.
At the time, the Hydrogen or thermonuclear bomb was relatively new. The
USA and USSR both tested H Bombs in the 1960s, so people were aware of its
power and concerned by it.
During WW2 the government organised Civil Defence measures to protect against
air raids and make sure emergency food and medical care was available.
During the 1950s and 1960s the government produced many Civil Defence films,
cinema advertisements, TV programmes and leaflets. This is one example.