(23 Feb 2015, 7:27 pm)Michael wrote You have a few choices
X21/22/23 - Arriva
X7/X35 - GNE
=D
I obviously mainly stick to Arriva on these sections, but the X7 seems to be a popular service especially between Peterlee and Sunderland and having an extra bus an hour between these points might increase passenger numbers.
I know there is the X35 but who really wants to spend the best part of an hour on that heading to Sunderland via Houghton.