I wouldn't really call Nuneaton and Tamworth 'minor' - they are both larger than Stafford (and Crewe!) and have more connections than the former!
First of all, I disagree that Nuneaton and Tamworth actually
need frequent direct services to London.
Tamworth:
Tamworth [07:47] to Rugby [08:18] (LM Stopping Service)
Rugby [08:23] to London [09:13] (VT Fast Service)
Overall journey duration:
1h 26m (compared to 1h 57m on the LM stopping service).
A
direct VT service from Tamworth to London takes 1h 10m - the current arrangement takes only 15 minutes longer!
Nuneaton:
Nuneaton [08:02] to Rugby [08:18] (LM Stopping Service)
Rugby [08:23] to London [09:13] (VT Fast Service)
Overall journey duration:
1h 11m (compared to 1h 42m on the LM stopping service).
A
direct service from Nuneaton to London takes around 1h - the current arrangement takes only 10 minutes longer!
Introducing frequent direct services between Tamworth/Nuneaton and London would, in my opinion, be of no significant benefit compared to the current arrangement.
Withdrawing frequent direct services between Crewe/Stafford and London would
significantly impact the journey duration to/from London and these stations.
Further, your proposals would leave Rugby with no northbound (WCML) sevrices between about 0930 and 1700!
Rugby to Crewe via Birmingham New Street takes only 15 minutes longer compared to Rugby to Crewe via Stoke on the direct London Midland service.
Rugby to Liverpool/Warrington and stations north thereof is
slower via Stoke and Crewe on the London Midland service than via Birmingham New Street.
The only exception is Rugby to Manchester, which takes almost 30 minutes longer going via Birmingham New Street than via Stafford on the London Midland stopping service. Forcing all journeys between Rugby and Manchester to go via Birmingham would also significantly increase overcrowding on the Birmingham to Manchester route.
Therefore, I amend the "proposed" London Midland (or even Virgin Trains) service to: Crewe > Stoke > Stafford > Rugeley > Lichfield > Tamworth > Nuneaton > Rugby > Watford (avoiding Northampton) > London Euston.
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Could you justify running this as well as the existing hourly Trent Valley LM service?
No, the "current" LM stopping service would be cut short, running between Northampton and London Euston only. The Crewe to Northampton via Stoke portion would be replaced by the "new" service.