Not totally sure how 'odd' this is, but 4501 operated the 43 today, through to Morpeth.
As I saw it, when it was in Bedlington, I thought about how much has changed in just over a year, last July it probably would've been operating the X21 that passed through minutes later, or a 35 that it would've seen in Morpeth, now it's a vehicle (type) that is pretty hard to find.
RE: Arriva North East: Rare & Odd Workings - September 2015