The irony here is the 805/807's whilst late are not showing the same issues as the 810's and given Lumo (First) and Grand Central have placed orders recently Hitachi aren't damaged goods in the eyes of other operators.
There is the fact that the 810s are shorter; so this suggests that the 26m variant specifically isn’t seen as damaged goods.
I can’t help but think that Hitachi won’t be promoting the 24m variant once the 810 fiasco is finished. However, to be fair, to fit everything into a carriage 2m shorter was always going to be a big ask.
Can the government force the hand of the leasing companies if key infrastructure is at stake? If EMR have to start shedding 222s without the 810s ready, the service will be unbearable for passengers.
As others have said, they could do, but probably won’t be bothered.
Also let’s bear in mind that, according to other users, plans were drawn up to utilise 170s on the mainline service, something which Avanti couldn’t have fallen back onto.
So, if push comes to shove and the 222s do go before the 810s are introduced, let’s not be surprised if these plans get revisited.