@Polaris OBark:

Cheers again mate- that sounds sort of what I'm now expecting: isolation on the actual road, but dotted with a few outcrops of camping/stops etc. I'll research and prepare accordingly.

The way my training is shaping up, I should be good for going over the stated average of 40 miles per day too. I know that's going to be flexible and that I'll get fitter on the trip itself too.
Saying that, I'm prepared to wild camp when needed aswell- I've loads of experience of this in the past so it shouldn't be an issue- except for my imagination jumping at every single little noise in the night..!!!