(Above: the rare first ed. UK dust jacket)
A novel I once taught when I started teaching high school English in 1972-3. It’s a 1957 UK SF novel set in an English village in which all the women become simultaneously, mysteriously pregnant during a bizarre gas ‘Dayout’.
The first (b & w 1960 UK) movie was based closely on the original. George Sanders and the kids are pretty good in it. It even had a sequel.