I also found a new bridleway (which is sort of two bridleways). This runs from Whinfield House (note: After leaving the road, the BW takes a sharp left, through a gate) to Aycliffe Village and then on to The Blacksmith's Arms.
The first part of the track is slightly overgrown, broken tarmac, which is singletrack in places, becoming more open and dirt-road after the motorway bridge. The second half is a farm track running past a farm building and through fields. The Blacksmith's Arms sells Black Sheep ale and has a large beer garden. The tracks seem like they'll cope with a lot of rain, and could be good for local rides through the autumn and winter.