Thanks Paddy. It seems that the most recent book is Paul Hannon's (1998) , which is a whopping £3.97 from Amazon.
For those who are wondering what it is:
"Nidderdale Way
Devised in the early 1980s, the Nidderdale Way is a 53-mile waymarked route in North Yorkshire. The Way encircles the valley of the River Nidd by means of a wide and varied range of footpaths, bridleways and country roads, taking a course up one side of the valley and returning down the other. As such, the outward and return legs are never far apart, making it very accessible to the day walker: the finest means of tackling it, however, is as a four-day walk.
Nidderdale is the easternmost and probably least known major valley of the Yorkshire Dales, and it concedes nothing to its National Park neighbours. Indeed, the vast majority of the Nidderdale Way is within the Nidderdale Area of Outstanding Natural Beauty, a belated recognition of the exceptional scenic qualities of this landscape. The Way enjoys a delightful route that takes in the vast majority of the dale's attractions, including the natural features of Brimham Rocks and How Stean Gorge, the holes of Goyden Pot and Manchester Hole, the reservoirs of Scar House and Gouthwaite, the landmarks of Yorke's Folly and Guise Cliff and the sleepy villages of Ramsgill and Wath."
The Nidderdale Way
Having now plotted the route in Viewranger it seems that the whole thing is well furnished with campsites at sensible points and so though the preference would be for discrete wild spots, we will have plenty of options.
Edited: 07/03/2012 at 22:44