One of my earlier ones this. Down the Tees in 2006. After a rather wet day crossing the North pennines, which was redeemed by Caudron Snout being very lively, just sunshine and mostly lovely walking. I did crack and divert over the moors rather than through 'Boro on the final day. Cross reference the Teesdale section in the day walks folder for a bunch of trips up/down parts of this at other times. Also parts of the Yorkshire boundary walk although the weather then was flat out ugly.