Mothy’s post mentions Allegedly Discredited earthlights during the 60s and 70s, and perhaps that’s what the following relates to – but that would still be an interesting merging of ancient and modern folklore themes?
Cley Hill was the home of the king of the Wiltshire fairies, who was responsible for the lights seen there.
Apparently from Mike Howard’s article, ‘Contacts with unreality’, in 3rd Stone 19: 4-5 (summary taken from the Alternative Approaches to Folklore bibliography by Jeremy Harte, here:
hoap.co.uk/aatf1.rtf