On your substantive comment.
I am continuing my progress north and east.
After Exeter there are parts of many routes that I expect to follow.
For example, from Exeter is was that eastern section of Orange Way.
From Hawkchurch I expect to follow a relevant part of Monarch's Way through to the floating harbour of Bristol.
Then Offa's Dyke  and Wales Coast Path to Chester.

From Chester my route is still under consideration but one destination is Settle and from there to Carlisle following the, as I understand it, the cousre of the Midland Line.

I am open minded about how to restart at Isle of Whithorn, Dumfries and Galloway.

From Isle of Whithorn there are four marked routes that, more or less, provide a continuous route to John of Groats.

As before, my pupose is to take GPX files to use on my Android tablet (private use only) and (as before) to delete any thing I have created.

PS
I have walked Whithorm Way from Paisley to Ayr, a small part of West Highland Way.
I have driven Settle to Carlisle twice (a through walking route coincides about 80%) and the between Fort William amd Inverness.
Amd spent much time viewing aerial and street level imagery.

This route will bypass the ancestral areas three of my grandparents. 

Regards