Give them time to bed in...
The Voyager runs on the North Wales Coast are subject to frequent cancellations too, so it's not unique to the IET.
Today this service only ran Birmingham-Crewe (with 805 003), and then on to Euston 4.5 hours later.
The explanation on RTT was "an issue with the train crew".
If Avanti can't find trained 80x crew, you'd think a Voyager would be turned out instead.
The 1248 Holyhead-Euston was also cancelled.
Avanti don't deserve more time for them to bed in - the service should run or be substituted, which is what TfW try to do with the Mk4s on the same line.