(05 Dec 2013, 6:06 pm)Tom wrote I suppose you've got a point there! - Do you know if the X20 is the busiest? If so, that wouldn't be part of the ''Prince Bishops'' brand, and use a President?
Based purely on observation, the 20s are a funny service.
Between Houghton and Sunderland - it appears to be the bus of choice, with it being quicker than the 35's.
The 20a and x20 benefit from serving Rainton Bridge, although at times it can ride through without stopping.
It does have through passengers, but it appears the 20 has more travelling to/from Durham from the Houghton/Hall Lane/Gillas Lane area.