Children of the Stones was a television drama for children produced by HTV in 1976.
It followed the adventures of a scientist, Adam Brake (played by Gareth Thomas of Blake's 7), and his young son Matthew after they arrive in the small village of Milbury, which is built in the midst of a megalithic stone circle.
Filmed at Avebury, Wiltshire, it was an unusually atmospheric production with sinister, discordant wailing voices heightening the tension.
The series is, by those that remember it, frequently cited as one of the scariest things they've ever seen.