I don't know if this is of any value to other members but I had a go at putting in the route to Barnard Castle and a couple of others.http://www.cycle-route.com/ Route to BC was via Whorlton and then back via Staindrop and Winston, Cauldwell, Manfield etc. Route markers every 2 miles so distance is probably off as not every twist and turn is marked.
http://www.cycle-route.com/routes/Stapleton_to_Barnard_Castle_Loop-Cycle-Route-2523.html
Other route was longer:
Stapleton to Middleton Tyas (total 6 miles)
Middleton T=> Scorton (total 10 miles)
Scorton => Catterick Garrison (total 15.5 miles)
Catterick Garrison => Wathgill (total 20.5 miles)
Wathgill => Grinton (total 26.5 miles) — Stop at the Dales Bike Centre (http://www.dalesbikecentre.co.uk/index.html) –
Dales Bike Centre => Richmond (total 38 miles)
Richmond => Skeeby (total 41 miles)
Skeeby => Middleton T (total 44 miles)
Middleton T => Stapleton (total 49.5 miles)
http://www.cycle-route.com/routes/Stapleton_to_Grinton-Cycle-Route-2522.html