A686 Penrith to Alston, stopping off at the Hartside Cafe
Heading west from near Ambleside, try the Hardknott & Wrynose passes, not roads for speed really worth doing for the views and the 1 in 4 gradients and hairpin bends, a few decent pubs in Boot village and a good campsite at Eskdale.
A6 over Shap, a great stretch of road & fairly quiet as most of the traffic will be on the M6.
A few starters for ya, I'm sure lots more will be posted
Here's a link to the campsite we stayed at in Eskdale, couple who ran it were really nice (think they're still there), even to the point of letting me park my Fazer in their garage overnight