So with 22x StreetDecks still due, I take it these will simply slot in to the PVR of the X31/X45/X46 (13x) & X47/X70/X71 (9x)

Still very surprised given the frequency reduction that the newer ones will unlikely be allocated to the X21.

Are 6118-21 still bound for East Yorkshire or has that since changed? What will be available for the X5/X15?

Only way I can see X-Lines spec vehicles being available for the X5/X15 would be a permanent reduction to the frequency of the Fab 56 + 6099 from Percy Main.

I reckon for simplicity sake something like this will happen

Chester Le Street (2x spare covering PVR 23x)
- 6302-03 Spare
- 6304-07 X-Lines X21
- 6315-29 Angel 21
- 6330-33 X-Lines X21 (6330 repained to X-Lines)

Consett (2x spare covering PVR 26x - excludes X30)
- 6096-6099 X-Lines X5/X15
- 6100 Spare
- 6301 Spare
- 6356-68 X-Lines X31/X45/X46
- 6369-77 X-Lines X47/X70/X71

Deptford (1x spare covering PVR 11)
- 6084 Spare
- 6085-95 Fab 56

Percy Main
- 6101-16 Cobalt & Coast 309/310/311
- 6117 Spare (But Cobalt & Coast branded)
- 6056-68 Coaster
- 6069-70 Spare

Riverside & Hexham (5x spare covering PVR 37)
- 6001-07 Crusader
- 6043-44 Spare
- 6045-47 Tyne Valley Ten
- 6048 Spare
- 6049-55 Crusader
- 6071-83 Tyne Valley Ten
- 6308-14 X9/X10
- 6334-35 Spare