The 730/0's are not planned to run north of Milton Keynes, and with maintenance at Bletchley there is no need for moves to Northampton as was the case for 319's.
The first 730 diagram will be replaced either 23rd or 30th October with a further one the following week. The third will be a couple of weeks behind them.
Bletchley guards the only ones being trained on 730's for West Coast use, and they do not sign the Trent Valley route. Northampton and Crewe guards share work on the Euston-Crewe services.