I know if the X21 didn't go to Newcastle, I wouldn't bother going. In fact, since moving to Bishop a few years ago, I've been to Newcastle more times than 10 years I lived in Gateshead!
There's nothing in Newcastle that I can't to at the MetroCentre, so if anything terminating buses at Gateshead would likely cause a lot of issues with Eldon Square. If you're going to change buses, why not go to MetroCentre instead
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Go North East: Service Suggestions v2