Got home tonight to find that the post office had tried to deliver a recorded packet at 10 AM. As usual went round to the local sorting office (which isn't far away) only to find that in the last few weeks they have changed to opening 7 AM to 1 PM. Turns out that it said so on the card, I just hadn't noticed. So customers who are not at home at 10 AM one day are expected to be able to get round to the post office place at e.g. 10 AM the next day to collect mail that they've missed.
How people who are on an early shift or otherwise unable to get there at this time isn't explained. Fortunately I can probably get round there on my way to work tomorrow if I leave early, but it's going to be VERY inconvenient.
Expect this sort of thing to happen a lot as the post office "rationalises" its service.