MarkG, your cynical views of gov'ts assessments of its citizens' worth seems reasonable based on film-release dates alone.
Kramer's ON THE BEACH arrived in 1959, closer to Godzilla and Harryhausen radiative monsters than the British THE WAR GAME (1965). Obviously Kramer and those writers were aware that a nuclear-winter scenario was likely, and that survival didn't matter since was only months, weeks or days - not some once-considered 'infinity'.
Six years later, THE WAR GAME arrives on BBC-TV.
I wonder if furniture wax sales increased the next week?
Or maybe prospective homebuyers had a new item to consider: "How tall are the street gutters?"