Oh and another thing... The Langley Park-Chester-le-Street section of the present X25 would lose it's link to Gateshead and Newcastle; believe it or not, it gets a few passengers. A change at Chester-le-Street would be an inconvenience. Passengers don't like being inconvenienced.
I think the aforementioned services are fine how they are. No need to change them.
RE: Go North East: Service Suggestions