When I lived with my parents, I actually watched the postman walk down the drive, push a card through the letterbox and walk away. He didn't ring the bell, knock or anything.
He didn't like it when he walked past the front window I was watching him from and I said
"Would you like to try that again?"
As to Parecelforce. I made them deliver my parcel yesterday. I wasn't in. So they've spent money picking my parcel, planning the route it needed to take, sending a van over from coventry (70miles - hopefully, they didn't have much else to deliver over this way) attempting to deliver it and then thankfully, they've left it at a post office 3 miles away.
So I've got out of paying £12 for it to be delivered when I'm in as I can pick it up on saturday and also hopefully, the logistics involved will have cost them more money than they made.