As noted a few pages back, 7446 has entered service at Ashington operating 35C today.
Arriva Northumbria: 7446 | NK05 GWY by Tommy Simms, on Flickr
I've also been informed that 0664, which is currently VOR due to a broken air dryer will transfer back to Arriva Yorkshire in the coming weeks.
RE: Arriva North East: Latest News & Discussion - October 2015