The problem with the 685 for GNE would be running beyond Hexham with no support (which, to be fair is also a problem for Arriva).
In some ways it would be easier for GNE having a depot at Hexham, but they would need space for the extra vehicles (though maybe they would reduce the frequency from 3 per hour between Hexham and Newcastle - including X84/X85 - back to two per hour with one per hour running to/from Carlisle) - ie just run the '685' between Hexham and Carlisle.
More likely that Stagecoach would operate 685 (only between Carlisle and Hexham)?
RE: Arriva North East - Latest