(08 Feb 2015, 6:41 pm)Dan wrote Yes, you're right.
Prior to October 2012, services 15/15A were operated by single decker vehicles and there was an extra weekday journey (numbered 815) in each direction on the morning school run, operated by a Volvo Olympian. As part of a consultation held in August 2012, Go North East decided to withdraw this extra weekday journey completely and replace the single decker vehicles with double decker vehicles to provide the extra capacity when it's needed at peak times.
I remember the 815. Just as an extra piece of information, the PM journey ran off Scholars service 825.