But what could it be?

OK, last post for the night then I'll bugger off and read, promise.

Just noticed the other day that SFX have placed a humble request from yours-truly (submitted what feels like years ago, but is I admit probably just months) to their SFXperts column. You can find it here, it's the third one.

Now this series has bugged me for years, for a while I suspected it may be something like Earthfasts, or Children of the Stones, but I'm positive it's neither. And when I say bugged, I really do mean it's driven me loopy.