North Wales/Chester shown as truncated Crewe-Holyhead only for the 2nd Jan (no Crewe-Chester shuttles) but at first glance looks to be most of the service for 5th Jan (0932, 1232 and 1932 Chester to London missing at first glance).
There is at least one service which runs all day as a 10 car back and forth to Holyhead (0445 Holyhead - Euston, 0902 Euston - Holyhead, 1448 Holyhead - Euston, 1900 Euston- Holyhead ?) which I assume has donated a set, and it looks like a couple more have been borrowed from the reduced service on the 5th. 805s also do New Street so assume more have come from there?
I can't see that the blockade units can be 10 cars with all those units still being used for North Wales services, and do bear in mind that Avanti get a roasting from the Chester/N Wales MPs because a) the service was much reduced for some time post-covid b) it suffered badly from unreliability during those strikes of a few years ago and c) the whole Senedd vs Westminster thing.
"Hey North Wales we have borrowed your trains for two weeks" wouldn't wash.