I live in South West England and visit Scotland as often as I can.
I have found many A roads in Scotland to be a lot better maintained than those down here.... however. I have also found that the replaced surface of a road can return to the original surface almost at random, and more than once, especially on roads less used by tourists, I have found a significant change in surface either mid corner, or near the entrance / exit to a corner.
The one I especially remember was on the A839 from Lairg to Ledmore, which is an excellent road on which to 'make good progress'. I was fully loaded on my 650, enjoying the road and half way around a rise and fall left hander (with a blind apex), the surface changed from new, smooth tarmac, to broken, top dressed gravel / tar. The suspension took care of things and we rattled over the horrible bit, but at most I was doing 62 mph, so a more 'sporting gentleman' could easily have found themselves in trouble.
I've had the same in Devon, where the County decided to top dress, with nice fresh, loose, gravel in random quarter mile sections, one of the most enjoyable roads in the county. That made for a puckering experience... several in fact, as the gravel was so deep that even at 20 to 30mph it was very much like green lane riding.
Keep safe everyone.