What about using land on the IAMP at Washington for a potential depot, You could then potentially merge Deptford/Washington/Percy Main and Peterlee together thus creating a "Hyper Depot" of sorts with Chester-Le-Street ops being split between Consett & Riverside.
It would mean you'd have 3 Major Depots in the Region with Hexham/Saltmeadows as they are, I think what operators also need to take into account with Park & Rides being set up such as the one at "The Angel" I am sure I read within the document for strategy moving forward was for such services to use Articulated Buses that there is sufficient space for these to be kept, then you have the likes of Go North East investing in Electric Buses moving forward so with that has to come with investment in new depot infrastructure.
RE: Go North East : Upcoming Service Changes