27172 covering a 52
27180 has replaced 27166 on 58s
And as for the 'rare' and 'odd' workings, I'm going off what the fleet cards have down, hence 22345 being on Newcastle's 12 is an odd working as its down for Enviro400. Of course, some of the Stockton ones can be counted out - unbranded E300s on 36/37/38 for example unless it's a MAN example - because they are booked for E300s. 'Zone' and 'Dotty' off-route doesn't seem to be all that rare at present due to the radio issue (the new examples not having any hence the 64-regs are being allocated to the late 52/58/59/61 turns). Hopefully the reason why they've not been fitted with radios yet should become clear eventually...
RE: Stagecoach North East: Rare & Odd Workings - October 2015