Spotted a Sapphire 6 vehicle pulling away from the Gore Hall Estate stop, Sunderland-bound at 3:15-ish - about 15 minutes after any bus was due to leave that stop. No idea how long it had been there, as it hadn't passed me. No idea if it was actually working the 22, either - couldn't see a number on the back, but there were 2 lines of text, too small and far away to read.
Just as that left, 1597 came up the high street, Durham bound and off route - no display or lights and only one guy in a high vis in addition to the driver. I have no idea whether the two sightings were related. It wasn't the bus that was meant to be working in that direction, at that time, as that came through Gore Hall at the same time.
RE: Arriva North East: Rare & Odd Workings - January 2016