Really interesting thread, thank you OP 
Several years ago, my DH (unknowingly) dropped his phone in a car park. When we got home, there was a message waiting for us to say that someone had picked it up and would keep it safe until we could collect it. He lived on a travellers' site just down the A1 from you. He wasn't there when we got there, and we were directed to his van. The phone was on the seat, and we replaced it with some beers to say thanks!