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"Cropredy finds one of these 'dead-straight' lines and tracks it for a distance of, say, 1km. Inserts own markers at 100 metre intervals or so. "

Dashed good idea. It's probably redundant to say so, but if no blindfolds are to be used then the line ought to extend over the brow of a hill... ;)

Here's a funny thing BTW, a Yuletide teaser.
Leylines, so far as I know, never go up cliffs. I wonder why?....

Nigelswift, I dont want the test to be too easy, it would bore Me, through buildings ,up and over hills.
I,ll give You , spirals, left and right, polygons , still W.i.p as regards labyrinths, must go to Chartes.
Not up and over Silbury hill though, they did something magical there, that is also w.i.p.