New times now on Traveline for changes effective from February 17th, some info about changes to Darlington services that I spotted:
1 - the evening and Sunday service 1B is withdrawn and replaced with the daytime service 1 route.
5/5A - evening and Sunday journeys now running as service 5 instead of 5A to replace the 1B along Redworth Road and parts of Byerley Road in Shildon.
X21 - on weekdays the first Peterlee to Sunderland departure will now be 08:44, returning from Sunderland at 09:20 and the last Sunderland bound trip will be at 15:44 from Peterlee and 16:20 from Sunderland, Saturday journeys will not be cut on Peterlee - Sunderland section. Additional running time between Newton Aycliffe and Sedgefield will be removed on some journeys.
Other than all that, think it's mostly just things like timing changes and the odd journey being withdrawn here and there. Imagine some interworking patterns on evenings and Sundays at Darlington will change judging by changes to timings.
Arriva North East: Upcoming Service Changes