I described on the other thread the situation yesterday which seemed to have prevailed all day.
It started around 0630 with some issue at Wembley depot, reported as signals, which prevented the early starters getting down to the station. Now these trains should be fully prepared and not in need of any cleaning etc, despite which when they (at least, the ones not cancelled as a result) got to the station, late (after normal departure time), it was still "Preparing" for a considerable time. So it seems like some bureaucratic "we're ready now" message is being awaited, rather than actual work in hand.
Other services were moving from Wait status to Cancelled after their normal departure time.
Never seemed to catch up, it was still all disorganised by 1900 when I returned, with all services I encountered still notably late. Into Euston, walked up the ramp and was met going out into the concourse by a typical stampede for a train just opened up in the adjacent platform, crossing us at right angles. It really was a wonder nobody was knocked over.
The reservations seemed to go up on the inbound train some minutes before arrival, presumably for the next booked working, but I wonder if it's being anticipated that maybe there will be a last minute set swap, so hold everyone until certainty.
If a train advertised as leaving at 1900 is still Wait at 1855, and then suddenly has its platform announced with no more information about departure time, and if passengers have encountered countless messages and announcements about tickets valid ONLY on the specified train, otherwise pay again (which should be emphasised as "pay again many times what you did before"), then no wonder. One day the legal industry is going to make their own fortune from some event here.