That is awesome, thanks! In many cases it was a guessing whether a road on the map is a tarmac lane, a gravel road, a deteriorated track or just a path. OpenStreetMap tells the levels sometimes better, sometimes not. And Google Maps are sometimes badly outdated and missing on the smallest roads.
My earlier plans had Wythop use this bridleway upwards to remove the long straight, but it's probably too narrow. I bet they would have done it in the RAC days!
Here's the situation in Grizedale East https://www.geograph.org.uk/photo/2129490. I believe this is the junction where Vatanen rolled in 1989, looking better https://www.geograph.org.uk/photo/2568340