The schedules were set on both my and my wife's UVO app to exactly the same as entered into the car. What seems to have happened is that the scheduled showed up at some point during the evening as "off"- not sure when exactly but it was after eight. The app scheduled charging screen showed the slider in the off position, whereas it had been on earlier that evening. It was easy enough to move it back to the on position, and reimpose the schedule to the car, which worked.
As I said earlier, it hasn't done this for a while now, where it was doing so every evening before. Maybe it has a learning function in there. It does look to be UVO-driven to me, though I may be wrong.
On the car starting to charge, I've just been out there and plugged it in, locked the car, and switched the charger on. I can confirm the charger port light was still on when I did this, but the charger didn't start charging immediately. The single flashing green light on the dash came on until the port light went out. UVO shows the charger as connected and waiting for the schedule to kick in, which is as it should be.