(30 Dec 2017, 1:10 pm)tyresmoke wrote Suspect the 13/13A will run from Stockton in a loop from Grangefield one via the current route to Salters Lane then back direct via Durham Road & Bishopton Ave with the opposite half hour going the other way round. That would presumably save the 10 minutes needed to serve Stainton & Hemlington half hourly via one standard route.
This is now confirmed, although buses will only serve Stainton in one direction, opposite half hours, one towards Hemlington and one towards Middlesbrough.