My Jaws 3 was dispatched 24 hours after 2 & 4 - at least, according to the dispatch emails. But all 3 turned up together on Saturday.
I've been experiencing real problems with Royal Mail recently whereby stuff has been arriving several days after it should have, including stuff that people have sent me using their 24 hour or 48 hour tracked services, often turning up 2-3 days after it should have. When I mentioned this to the postie one day as he handed me a parcel that was over 2 days late, he admitted that the day before there had not been a delivery at all in my area due to staff shortages, so it's just been stacking up in the delivery office and they've been struggling to clear the backlogs.