I have to agree, and having looked earlier I think I can guess the two to whom you refer.
But railway senior management don't help. According to Journeycheck, Northern are accepting TPE tickets, but not Avanti tickets. For crying out loud, when something like this happens the railway should just come together to get passengers to their destination by whatever alternative routes are available - its just another example which illustrates why an overall railway 'Chairman' is desperately required, if only to bang heads together.
Apparently there was one chap needing to travel from London to Dumfries this morning. He caught a King's Cross - Edinburgh service and, once onboard, asked Avanti whether he could alight at Newcastle then catch a service to Carlisle for another to Dumfries. Avanti told him no - he had to travel to Edinburgh, then across to Glasgow for the next service all the way down to Dumfries.
Some passengers, travelling from Edinburgh to Warrington yesterday afternoon, just after the derailment occured, are reported as having had to find their own accommodation in Carlisle. This morning they've been told that they shouldn't travel as there is no other available route from Carlisle to Warrington.
Embarrassing.