**** My initial thinking was that the article is just crying out to have some of its sections refactored into a "route" section, and that there's probably good sourcing for the route, a prose description thereof and probably other things as well, in the books cited.  Unfortunately, I have no access to the books.  By the way: You've demonstrated once again that other people's access to sources is superior to mine.  I have no access to The Guardian newspaper in the 1970s.  ☺ My educated guess is that if you pull up the books by Sellers or by the Kelsalls, you'll find all of the distances and intersections ready-made.