Having a bit of think, would it be worth putting the 50 under the Prince Bishops Brand to further promote the Links between Durham & South Shields, after all the 50 provides a faster service than the 20/20A/X20 combined between the two termination points albeit via a different route.
Furthermore I think the 50 should follow the Arriva 64 around Durham City Centre rather than serving the Bus Station, surely its losing out on potential passengers between Durham & Arnison Centre to the 64.
RE: Go North East: Service Suggestions