Possible Sapphire Routes at each depot

[Westy]

Wednesfield,  I would've thought the 9 personally as that uses newer ( or supposed to! ) newer vehicles anyway.

[arrivaaston]

Burton-X38 with Pulsars, Cannock- 1 or74/75 Pulsars, Derby-37/44-E400, Stafford-9 with versas, Telford 44 with pulsars, Shrewsbury 8 with versas, oswestry 70 with pulsars, wednesfield 9 or 10 e200 or 400

[arrivadays]

If it was Shrewsbury, I would've said either 64/164 (with Centros/Pulsars) or 81/X5 (with Versas - but the 12-plate ones), IMO.