For me, it’s perhaps slightly easier.
- The Edinburgh service, assuming it will soon be the only XC north of York (see all relevant documents), will need to be 8 coaches. The only other logical 8 coach route south of Birmingham is Bournemouth, therefore that makes it an hourly Bournemouth to Edinburgh. As Southampton Airport has effectively collapsed anyway, it makes sense for them to get the connection to the North East and Scotland.
- The ‘slower’ service from Birmingham to Nottingham will soon be with WMT anyway, so that takes one Nottingham path out. Same applies to Leicester, which will also be WMT on an hourly slow service.
- Bristol starter XC should be a 4 car, and go to Nottingham. Stop also at Ashchurch, or Worcestershire Parkway, as required. Bristol is the regional hub, so it makes sense for Worcestershire Parkway to get that service. At the other end, to Nottingham.
- Cardiff starter XC should be a 5 car, to York.
- Plymouth starter could be a blended 5 and 8 car service to suit capacity at certain times. To Manchester using the Bordesley run.
- That leaves the additional service from Southampton or Reading, probably 4 or 5 car, which could easily run to Lime Street.
That leaves an option on an hourly Birmingham to Manchester electric, and an hourly Birmingham to Liverpool electric, both 8/350, probably using a special fleet of 350/3 and 350/4 in pairs with a trolley and an improved First Class. They could even start back from Coventry or International. You’d probably want a Galton Bridge stop for wider connections, Wolverhampton, Penkridge, Stafford. That Liverpool would be the Winsford and Hartford; the Manchester would be Stoke, Congleton, Macclesfield, Stockport.
Works for me, anyway. Makes more sense. But, the usual suspects will appear saying it can’t be done, but everything can be done if you accept timetables have to change.