Some thoughts. Would this work?
- Chiltern reactivate 68/Mk3 on routes via Bicester, freeing some of their Turbos.
- These CH Turbos go to Bristol for local/regional services, freeing up some mini HSTs.
- Mini HSTs freed to work southwest-Swindon/Reading shuttles.
Looks like maximising 387s on electric routes is the way to go there, so that the available 80x can concentrate on bi-mode routes.
You wouldn't have thought it too hard to rapidly train 387 crews Swindon-Newport or Cardiff.
Are there any crews who sign both 80x and 387?
Donor TOCs can back-fill with their recent cast-offs if needed.
TfW can't do a lot outside Wales in their present state.
XC is already flexing its capability to help GWR.
Do Avanti have any spare Voyagers, to boost XC in LNER/GWR areas?
TPE/HT/Avanti/Scotrail should be helping LNER if they can.
Avanti could run some Edinburgh-Euston services with 390s if needed, as they (Virgin) did in the "volcanic cloud" period.