(09 Jun 2021, 3:01 pm)ian foster wrote 400's were services Northwards into Northumberland, double figure numbers were Gateshead as well as Newcastle. 800's were independent operators. There was one or two exceptions to this.
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EX/X1-29 - Blyth Expresses (X7-X13)
X30's - Ashington Expresses (X20-X29)
40's - Gosforth High Street (40's)
300's - South of the River Blyth (50's, 306/308)
400's - North of the River Blyth (Blyth: 1-2, Ashington 35)
500's - North of Morpeth (X14-X19)
600's - Hexham (685)
W's - Whitley Locals
That's Northumbria's numbering if I'm right, might be wrong though. It still exists to this date to some extent (in brackets).