I remember my old man (Yamaha R1 owner) showing me this website a while back that listed the best motorbiking runs throughout the UK. The site has dowloadable GPS way points, routes, images and video clips of some routes. It also have useful information such as bends ratings, straights, police activity, etc etc.
I found it and had a look at some of the routes. There is a lot of information indeed and some great runs.
the website
I think this one has to be amongst my favourites
Muir of ord- ullapool- scourie
If anyone has ideas about other favourites, please post the link