"Is your mummy who she says she is?"
On the subject of strange visitors to Scarfolk, in October, 1974, there was a spate of cases involving parents being supplanted by eerie impostors. The frauds looked uncannily like their real counterparts and only children could spot the subtle differences.
For a time, affected children found a gritty substance in their school milk. At first poison was suspected but it turned out to be sand from a beach hundreds of miles away.
Despite police investigations none of the impostors were ever positively identified and there was a growing belief in the community that they might not even be human.
The impostors vanished as inexplicably as they had arrived and the children's real bewildered parents were found wandering on the very same beach from which the sand had originated. They had no idea how they got there, how long they had been away, or what had happened during their absence.
This leaflet/flyer was distributed in comic books, at schools, and in toy shops.