> As some of you will know, I am interested in attempting to verify or refute,
> the existence of a long distance neolithic trade route from Grimes Graves
> marked by puddingstone way marks.
Going to where? I've thought for a while Grimes Graves is on / near a prehistoric trade route from Seahenge to Avebury.
Peddars Way -> Ickneild Way -> Ridgeway.
The number of prehistoric sites that the first two pass is well above random chance.