I have had it from Royal mail where a card was posted through my letterbox saying i was not in, I heard the letter box bang and ran to the door to catch a post man walking down my drive. I asked him for the parcel and he admitted he did not have it and they don't carry them to make more room for mail and to reduce waight. I then had to go to the sorting office to collect it and i made a complaint at the same time but it was never sorted to my satisfaction.
Since that day i have no faith in Royal mail and tend to use any other mail system i can for my deliveries if i have the choice.