(Today, 12:04 am)col87 wrote I might be wrong here but is the 29A not doing what the Stagecoach 10 already does for part of the route.
The 29A will run to the Parkway Centre from Martin Shops via Gunnergate Lane - last served as far as I can recall by Leven Valley’s 18 and 19. From the Parkway Centre to Cypress Road, it will presumably operate along Stainton Way. Journeys will interwork at Cypress Road - buses operating out of Middlesbrough as 29s return as 29As and vice versa.