I'd forgotten that we picked up the passengers off, presumably, 6358 on our way in, this morning. That one gave up in Chester-le-Street. (and, yes, some had stubbornly waited half an hour for the next X21 rather than catch one of the several 21s in the meantime). Though it looks like one of the 21s started from later in the route, too.
And that's with an R in the month so no excuse!
RE: Go North East - State of the Fleet