Without meaning to, my theme this GR seems to be distances and methods of locomotion in "Persuasion". ;-) I was struck by the fact that it would take the Musgrove party seven hours total to get to Lyme and back again. I realize that the roads were not good between Uppercross and Lyme, but I understood that a horse and carriage travelled on average about eight miles an hour. Did I get this wrong? At the rate they expected to go, they would travel not quite five miles an hour.
Also, I'm a bit surprised that none of the group seem to have visited Lyme, which I believe was quite a tourist spot even then, before.