Don’t want to get to be a Rollright Bore, but I was looking through “IN SEARCH OF ANCIENT ASTRONOMIES ” by E.C. Krupp last night, and there’s an article by prof Thom in there about alignments etc ...
There’s a drawing of Rollright, and it says that the line between the Whispering Knights and the nearest stones in the circle point towards the Midsummer Sunrise.
Looks about right, but I dunno ...