Afore mentioned A1 roadworks start on Saturday.
The Northbound slip road for the A1 at the Angel will be closed so expect diversions for the X22, 937 and Arriva X24 (likely both through Lamesley which they both occasionally use anyway)
So we can probably rule out Birtley as a route for the extra X21's, unless there's a very silly driver on board
RE: Go North East