(27 Sep 2020, 11:00 pm)Storx wrote I don't believe they do now, I live on the route and it's definitely Ashington doing evening runs lately, Blyth seems to drop in and does a random few buses at around 7pm though during the week anyway.

https://bustimes.org/services/57a-north-...2020-09-21

Seems very random but assume there's some logic behind it.