I'm not going to go into and bore everyone with the calculations, but I worked out that with electrification of the Midland Mainline and Crewe to Chester no EDMUs (Bi mode trains) would be needed to be ordered, and the new LDPE trains could be a nice simple order of LDPE EMUs or Electric Loco + Coaches + DVT.
Basically, the 222s displaced from the MML would be converted to EDMU operation for two reasons, one to save fuel, and two to extend them in length. These would operate the off wire services on the GWML.
221s would be displaced from ICWC by more new 390s, used to operate all LDPE services on the WCML, including those north from Manchester and Birmingham, some new diesel locos for off wire haulage on the north wales line, or the same ED treatment as the 222s.
The new stock ordered would be a nice simple, 10 or 12 car EMU suited to LDPE services. For the following TOCs as is now;
East Midlands Trains (Midland Mainline)
First Great Western (GWML)
London Midland (WCML Semi Fasts)
The off wire services on the ECML would go similarly to those of the GWML using displaced DEMUs converted to EDMU operation. Or where operationally convenient, attaching a loco to the new EMU (LDPE), to be designed into it.
Especially with Edinburgh - Aberdeen being electrified, ICEC wouldn't need many diesels.