Well, it didn't seem that long ago that the letters would arrive around 7:30 in the morning with some follow up stuff in the second post around midday (turns out when they shut down second post service, it never was an official second post schedule service but more of a sweep up service of stuff that should have gone out earlier on the first one).
So, for me, shortly after some changes, Post was arriving around 9:00am, then around 10:00, to become 11:00 and today nearer the 12:00 mark, then I get gap days, ok so I might not be very popular, but I can get up 2 days or more with no post, then if I actually check any dated letters or the post mark, find its at least 2 days old, hmmm.
Ive also noticed all the local letterbox's have changed to a next collection time 9:00am next day, so if you wanted your precious letter in the system on the same day then get your arse down the Post Office to post it.
So, hows it work for you?