A couple of years ago police came to my door looking for my neighbour's son. Since he is male, black and in his 20s, they soon got the message that they had come to the wrong house as I'm female, white in my 70s and disabled. They apologised and left.
A week later at 5.30am there was a ring at the doorbell which was a bit of a shock. Two officers looking for the above. I again explained I'm at no. 5 and bloke is at no. 7. They apologised and left. A week later, lone policeman knocks on my door, looking for same person I explained he has wrong house but he insisted on walking through my house. No I was not hiding the wanted young man. Another couple of weeks go by, I find three policemen have walked down the side of the house and are now pacing up and down in my garden. They end up getting comfortable on my garden chairs and I make them cups of tea.
Young man moved out of his mother's home, met a woman, they had a baby, he then left that woman, lost his job, found another woman and two years later, he and woman have moved back in with mother. Two days ago who came knocking at my door - yep the police.
I have a large, clear number on my door but the concept that 5 is not 7 seems to confuse the police.