The Norte is a bit squirrely in places, and I did my best to document as many of the old and new variations... including a few places where it is clear that the route may change at a moments notice. The good news is that the old routes do not become invalid, and there are always some arrows to guide the way. On top of that the albergues are always able to give some added guidance.... though do take all advice with a bit of skepticism as the people who run the albergues cannot help but have a biased opinion.
I did a count of the number of 'not officially the camino' variations in the book and there are 60 of them. They range from short deviations through a town to get to the pharmacies and other services, to going the long way around Santander, to the several places where the route splits into two places for the better part of a full day of walking.
I happened to have met
John Brierley in Santiago when I was getting started on the book; his reaction when I told him what I was up to was "please, thank you, and it´s all yours!" I look forward to revisions to it but would dread having to write it all over again.
Thanks everyone for the great support.