(02 Mar 2014, 7:46 pm)northtynelinks2 wrote Just been thinking, although what you said is most likely to be correct would 5337 and 5338 not act as the Lime spares at Stanley so the other 2 can go to Chester-le-Street.
As Kuyoyo has just suggested above, their role in the fleet is to act as a reserve vehicle for all services at Stanley (first point of call being the Diamond, then the former West Durham Swift services and Red Kite). Once both vehicles arrive and they settle down at Stanley, they should release two Volvo B7TLs, which will presumably allow for the withdrawal of two Olympians.
Assuming the Lime investment goes ahead and each depot does indeed get one red spare, then they will each replace one of the current red spares at each depot.