I have underestimated the distance of the route. It is actually 90 miles! Also, I have learnt that the road over Nateby will be closed to all traffic from tomorrow for road works. (Part of the road near the summit has disappeared in a landslip).
The revised route from KS will be - Reeth, Buttertubs, Ribblehead, Coal Road (Dentdale), Mallerstang.
11's at Tan Hill, maybe late lunch at Hawes. Total distance 65 miles.