For Witzend and others, the whole question of parcels going missing (or merely late) is a nightmare, right round the country, and it applies to just about all courier firms in my experience.
Evri's service depends on a postcode lottery (like the NHS?!), with a good driver it works pretty well, and others less so.
Parcelforce are erratic in the same way, I paid for a next day delivery recently, it turned up a day late, I complained, got the extra fee refunded. And that's happened before.
I see on our local F'book a steady stream of plaintive "who's got my parcel -- whose door is that??" comments, even FedEx I saw had misdelivered something last week.
Oh, and WHOEVER came up with that whole nonsense of taking a pic of the bottom of a door, and sometimes a pair of feet, to prove that they had delivered a parcel somewhere, could be bl**dy anywhere, should be removed for the purpose of becoming a multiple organ donor for people who deserve them . . . .grrrhhhhhhh!!