The timetable for this has been released (unofficially this morning via realtraintimes). The times are

Ashington -> Newcastle

Ashington (00/30)
Bedlington (05/35)
Bebside (08/38)
Newsham (12/42)
Seaton Delaval (17/47)
Northumberland Park (24/54)
Manors (Periodic)
Newcastle (37/07)


Newcastle -> Ashington

Newcastle (47/17 (or thereabouts))
Manors (Perodic)
Northumberland Park (01/31)
Seaton Delaval (07/37)
Newsham (12/42)
Bebside (16/46)
Bedlington (19/49)
Ashington (24/54)

Every 30 minutes until approx 8pm, then hourly until:

Last train out of Newcastle: 22:16
Last train out of Ashington: 23:00