(01 Nov 2020, 2:51 pm)Adrian wrote Go North East 8 and 50 is a good example:
8 towards Washington departs at xx:14 and xx:44
50 towards Washington departs at xx:18 and xx:48  

Arriva on an evening between Durham - Coxhoe:
58 departs Durham at xx:10
X12 departs Durham at xx:20

Is that from Chester? 
One of the many issues with Chesters services (or at least services running through there). I did a list once after a long wait there. It will be hidden in the forum somewhere.