The route in the v-graphics book is a bit short, and that loop isn't the best bit of riding in the area at all – I think it makes much more sense as part of a decent long ride. The route I link below is a bit more like it – proper good ride, and happens to have the best bits of several of the v-graphics routes in it, and some other nice trails.
http://www.bikehike.co.uk/mapview.php?lnk=http://www.cs.nott.ac.uk/~jqm/Long_Matlock.gpx
One day, probably once the kid is somewhat older and lower maintenance, I will manage to take a whole long day out and do this one – 100 miles into the White Peak from nearish to my house, taking in most of the really good legal* riding in the White Peak.
http://www.bikehike.co.uk/mapview.php?lnk=http://www.cs.nott.ac.uk/~jqm/White_Peak_Long.gpx
Joe
*It'd be easy to make it 150 miles with the naughty stuff that it passes, but I kind of wanted to keep it legal somehow.