It seems quite a few services that are single decekrs are being upgraded 

Arriva have made a move of some of there Pulsar to Ashington in swap for E400. These will end up on the 306 between Newcastle & Whitley Bay 

Go North East already confirmed the 1 will be upgraded to double deck. Wonder if the 19 will be upgraded to Long single deck buses 

Stagecoach don't seem to have done anything atm but could possibly see the 317 upgraded to deckers as well