Surely a better solution would be to route train one or two drivers at Riverside to do the 10, 21, 56, X1, X10 and 309 and have them on standby in Newcastle in case a bus gets full and drop in if needed. If not then just head back to the depot. Seems more sense than running numerous duplicates which likely won't be needed.

Similar Arriva Blyth could do the same for the 43, 306, 308, X10 and possibly X15/X21 aswell.