I'm not sure if this is concrete fact, or just a theory, but you can continue the line up Norway's western coast too. Then in the other direction, the line was broken, but restarts & progresses from Nova Scotia down through the Appalachians in North America.
I'm gonna be driving along most of Loch Ness early this autumn. Anything in particular I should look out for with respect to the Great Glen Fault? Any less-obvious geologic features?
https://simple.wikipedia.org/wiki/Highland_Boundary_Fault