The Stones of Wonder website (see links) suggests that the row is a lunar monument.
The middle stone looks a bit moon-like with all it’s cup markings at the top – could this have been an intention?
The stone sits a few hundred yards to the west of moon cottage, on the moon plantation. There is a strip of woodland just to the north called moon strip which follows the same alignment as the monument. I dont know if these were named after the possible lunar nature of the site or not.