In reality, the 335 could be amended to replace the 55 - although not sure if that will be possible until March as I assume that's when the current ones are valid until.
Scrap the FLE-Killingworth section (not needed as it duplicates the 62), amend route in Forest Hall and extend to Newcastle. It would only take 1 extra bus if they are wanting to run half hourly Forest Hall-Newcastle.
RE: Arriva North East: Upcoming Service Changes