That was service 23 did that between Easington village and dalton park, it ended because of the volume of traffic on a19 at the time. Service 24 started when 31/31a was withdrawnI thought there was a 24A or 24B that went to Sunderland but I may be wrong.
So Arriva stopped sending a bus down the A19 because of traffic and now they are sending another bus down the A19.
Hoping Solos won't be going down the A19 as they sound awful when I've had them on the X24 & X66.