In today's post was a birthday card. Although my address, it wasn't my name. As I didn't know if it was a joke (the name was unusual) I carefully opened it to find it was a birthday card to someone's nephew. No-one I knew, no-one with that surname in my road according to the 192 site. So I sealed the envelope, wrote "not known at this address" and put it back in the post box (along with the £10 note which was with the card). No postcode on the envelope so it will be difficult to track down who should have received it.