(25 Jan 2015, 11:08 pm)Robert wrote It appears that 4853 replaced 4854 at some point:

https://www.flickr.com/photos/128497080@...otostream/

I saw what appears to be 4854, just before 12, heading into Chester on a Consett bound service.
Reckon people can draw their own conclusions as to when Lee took this photo and Dan took his, and when the vehicle swap took place